Here is the suggestion.When someone gets posted on a BTA that is warranted, it would give you mods much less work to be able to suspend that person from posting on the Have/Wants, Selling Forums.
This would cut down on a lot of work for you, I know it would be best if members followed that rule.
This could also be used in situations where you can tell a members is peeved off about something and is normally a good members and starts questioning authority left right and center.
Being forced to take a time out usually gets people on the right mind track and it will stop someone who usually is a contributing member here from becoming a destructive force (I'm using speechjew as the example here because he has been a good member until his recent blow up)
I believe a system like this if implementable has more Pros then Cons.