Me again with another query.

To encourage more members to contribute on my forum, I have a little contest going where they can win 1 month premium access to a popular filehost.

I'd like to make that an on-going incentive by awarding such a prize to the member who makes the most posts each month.

Is there any way a selectbox, or filter, or new column can be added perhaps to the most-active statistics to show only the most active in the last 30 days?

Or perhaps another way of showing most active members for a particular month, or date range?

Ideally, this would be publicly viewable so members can also see who's the most recently active.