Answer: Yes.
I just tested myself, to make sure there were no bugs.
We just used different terminology, as I don't think Mark felt comfortable answering my Yes/No question, with the terminology I used.
--------------------------------------
Thanks for that. But you don't actually answer my question.

So, I'll try and do a quick test now to see.
Then I can explain the question to you further with screenshots and whatnot (real/a more specific example).

Edit: My post below should also be helpful to those who can't specifically discern what the functionality of this mod does (assuming your explanation isn't enough).

Example:
AdminCP settings: http://i.imgur.com/51fEQ4Q.png
Users profile settings: http://i.imgur.com/SYRwzpt.png

This is what happens if you try and go beyond the restriction:
http://tinyurl.com/z57568k OR http://tinyurl.com/oj7pegs
Note: Once you're going to hit the limit, this is what appears: http://i.imgur.com/OucPmeE.png
Basically, you must refresh the page if you want to continue to the post.

• My test results:
• [2] posts at maximum. You can not do the following after the limit (for [2 mins]):
  A) Replying in existing threads created by yourself.
  B) Replying in existing threads created by others.
  C) Creating new threads. Note: Creating a thread, increases your post count by 1.
  D) Replying in new threads created by yourself.
  E) Replying in new threads created by others.

• My test results:
• [2] posts at maximum. You can not do the following after the limit (for [2 mins]):
  A) Replying in existing threads created by yourself.
  B) Replying in existing threads created by others.
  D) Replying in new threads created by yourself.
  E) Replying in new threads created by others.
  
  What you can do the following after the limit (for [2 mins]):
  C) Creating new threads. Note: Creating a thread, increases your post count by 1.

• My test results:
• [2] posts at maximum. You can not do the following after the limit (for [2 mins]):
  A) Replying in existing threads created by others.
  E) Replying in new threads created by others.
  
  What you can do the following after the limit (for [2 mins]):
  B) Replying in existing threads created by yourself.
  C) Creating new threads. Note: Creating a thread, increases your post count by 1.
  D) Replying in new threads created by yourself.

• My test results:
• [2] posts at maximum. You can not do the following after the limit (for [2 mins]):
  C) Creating new threads. Note: Creating a thread, increases your post count by 1.
  
  What you can do the following after the limit (for [2 mins]):
  A) Replying in existing threads created by yourself.
  B) Replying in existing threads created by others.
  C) Replying in new threads created by yourself.
  E) Replying in new threads created by others.

@MarkFL
1)
What about not being able to do:
A) Replying in existing threads created by yourself.
B) Replying in existing threads created by others.

But still can do:
C) Creating new threads. Note: Creating a thread, increases your post count by 1.
D) Replying in new threads created by yourself.
E) Replying in new threads created by others.

2)
What about not being able to do:
C) Creating new threads. Note: Creating a thread, increases your post count by 1.
D) Replying in new threads created by yourself.
E) Replying in new threads created by others.

But still can do:
A) Replying in existing threads created by yourself.
B) Replying in existing threads created by others.

^ That's basically the two I was referring to in my question above.
Although now that I've formatted it this way, I realise there are far more variations that can be done than I initially expected.

Did you find the product did not behave as I stated? If so, where?

I tested it, and everything seemed to work, but at present I would like to know if there is anything you find not working as I stated. Once I know no one is finding any unexpected behavior (you know, bugs), then I will consider adding other features. But for right now, I have several other things I want to get done first.

https://vborg.vbsupport.ru/external/2015/12/17.png
Direct answer to my question:
- Yes, but for replies only.
The term "posting" is too general and therefore can lead to confusion.

These are the 5 conditions:
A) Replying in existing threads created by yourself.
B) Replying in existing threads created by others.
C) Creating new threads. Note: Creating a thread, increases your post count by 1.
D) Replying in new threads created by yourself.
E) Replying in new threads created by others.

Your explanation doesn't specify between all the terms (which my post above should help users with).
Specifically, you don't distinguish between posts as replies or posts as threads.
- Replying in [own/others] [existing/new] thread OR when creating [own thread] (still increases post count).

Summary:

New Suggestion:

Instead of radio buttons, have each condition as a standalone setting, where users can decide what specifically they want to limit (if any). Example:
- Replying in a existing thread created by yourself? [Enter Post Count Number],[Enter Time Duration Number]
Note: Leave Post Count Number blank to leave it as unlimited/the vBulletin default. Set it to 0 if you want to stop them from posting altogether.
Note 2: Leave Time Duration Number blank to as unlimited/the vBulletin default. Setting to 0 means you don't want any positing restrictions to apply.
- Replying in existing threads created by others? [Enter Post Count Number],[Enter Time Duration Number]
- Creating new threads. [Enter Post Count Number],[Enter Time Duration Number]
Note 3: Creating a thread, increases your post count by 1.
- Replying in new threads created by yourself. [Enter Post Count Number],[Enter Time Duration Number]
- Replying in new threads created by others. [Enter Post Count Number],[Enter Time Duration Number]

Other (3) Suggestions (ignore previous post suggestions):

I just discovered a bug right now:

- If you press the backspace/have another tab where you aren't restricted, you can still actually reply/create a new thread.

To prevent this, shouldn't you create your mod like the other mod, so an error appears immediately even if the user hasn't refreshed the page?
Example of a method (which you'd need to code in) when replying in a thread that should solve this bug:
https://vborg.vbsupport.ru/external/2015/12/15.png
Example of a method (which you'd need to code in) when creating a thread that should solve this bug:
https://vborg.vbsupport.ru/external/2015/12/16.png

P.S:
My post here is long, because it's mostly to help avoid confusion.
Not just for you to understand me, but for others to understand all your settings better.

My apologies for missing this - all vbulletin.org notifications were flying into our spam box!

Yes. The restriction on creating New Threads - whilst leaving posts/replies as unlimited.

I'll download and have a look at this Mark - many thanks for all your work.

One issue I can see is that the restriction can only be set for 1 usergroup? (unless I've read incorrectly).
In other words would it be possible for usergroup A to be restricted to 2 new threads, whilst usergroup X is restricted to 3 .... still allowing no restriction for Staff etc...

Brilliant work, though. Again many thanks.

As of now, the restriction is the same number of posts for all usergroups included in the restriction. :)

What about that Bug.

You never replied back to me, or checked my PM...

https://vborg.vbsupport.ru/external/2015/12/14.png

I do plan to investigate this soon...however, I have been receiving many PMs from users for help with their sites (on which I place a high priority) and working on other projects too.

I appreciate your feedback, and I apologize for not responding to your PM to at least let you know I will do my best to address the issue you found with this product. I also plan to allow for more extensive definitions of restrictions, on a per forum/per usergroup/per user basis. :)