Hey.

I was wondering if there was a way to make forum posts not count in a certain forum/category/section?

For example,
I have an Off-topic section on one of my forums, and there's a section where you can have forum-posting games, etc. Let's say a user posts on the forum game, but I don't want that post to add on to their post count. Can I make it so that the off-topic section will not count posts to the user's post count?

no this is not possible. everthing posted will be added to the post count.