suggesting plugin or hack to allow custom registration filtering

[phunksta]

Hi,

I've been searching for a hack that would allow me to do this, with little success.
I've researched how to build one myself, but I'm struggling with the required constructs to get to what I need.
I'm convinced it would be relatively simple, so can anyone suggest how I might procede?

FYI - Im a computing professional so I can understand concepts, but I know little about PHP, and vbulletin variables, so that's where I'm stuck.

The hack would do the following:

1) Triggered just before the activation email is sent
2) Would scan the registration fields, looking to see if conditions are met - these conditions preferably stored via vbulletin options, but could be hard-coded for simplicity
3) If any of the conditions were met, then the registration email would not be sent, but the user would be 'fooled' into thinking it had.
4) If no conditions were met, all would procede as normal.

So, I understand that I need a plugin XML file to set up my hack.
I understand I need to find the right hook to allow for (1)
I get that I can 'read' the registration details out of variables, but I don't know which ones - The one I want to try is TIMEZONE because bots always leave this as -12
Additionally it would be nice to add a custom tickbox to the registration form saying 'I am a spammer' that human users would have to untick to get a result. (thanks to whoever made the relevant post for that brilliant idea!)
Then, I understand that to thwart the registration email process, I need to raise an error to prevent further execution.

So how am I doing so far? Hopefully you experienced hackers will be able to furnish me with some clues on how to get started.

Doh!

Guess what I just found:

https://vborg.vbsupport.ru/showthread.php?t=141554
Hopefully this is just what I need