Cannot create new thread until member closes their previous one?

[mbooth]

I'm looking for some sort of plugin / mod that can offer the above restriction.

Basically I want to be able to stop members to only have x number of threads open in a particular forum (they have open/close permissions).

So I require something that checks if they have x open threads, and if so throw up an error message of 'please close your previous thread before opening a new one'.

I'm sure there is something out there, but my search terms are failing me.
Thanks.