Exclude posts in a forum from NOT counting to users' post count

[induslady]

Hello,

I know I can make posts in a forum from NOT counting to the users' post count, though it will get counted to the total posts of the entire forums(to show as site statistics).

I have a games forum whose posts have been counting to the users' post counts. If I make the posts in that forum NOT to count, it only avoids counting from NOW (i.e. future posts).

How do I subtract that forum's posts from the users' post count which was already made and got counted?

Any hack or plugin available for this?

Thanks.