That would really be a different mod...
I've used this one: https://vborg.vbsupport.ru/showthread.php?t=129390 (and I believe it will work in VB4) to do that very thing...

Add words you want to trigger moderation for, set the post count to very high, like 999999 and it will auto moderate any posts from any users using any words you specify, except moderators of course.

Does this mod allow for users to turn it off/on?

No... that would kind of defeat the purpose of the mod.

Well no, not really. Some people (me) prefer not to see the bad language, and some do prefer to see it. I would like to have the choice. :)

Then you probably want this mod:

https://vborg.vbsupport.ru/showthread.php?t=253026

Thanks. I do have that mod, and it is not working properly. Even if a poster chooses to not have the filter on, it still filters the words.
That was why I came looking for another mod.

This doesn't filter words already in a post- this prevents someone from submitting a new post with bad words.

If you let a user shut it off then everyone would see the bad words they posted.

I understand. Thank you. I am looking for one that will allow individuals to choose whether they want to see the bad words.
The other mod that is supposed to allow for that does not work properly for my forum. :)

Does this block pms too or only threads? I'm looking for a way to block words of my choice from threads only so that users can pm things if they decide to. Can I add words of my choice to this?

Thanks.

It only blocks in posts and threads. Yes you can add your own words.