I heartily endorse this. Leaderboards that somebody new or somebody not already close to them could never hit without everybody in front of them going inactive for long periods of time are pretty lame. They’re lame because people not on them won’t respect them as much as other leaderboards (“I could be on the most forums pwned board if I had signed up earlier” etc.), and eventually the competition for those boards is going to dry up. But leaderboards should be something that a relatively new player who knows his or her stuff should be able to say “With time and effort, I could probably get on that board” without asking for a hundred people to stop playing in the meantime.

Milestone ePeens would be a good solution, definitely for forums pwned. The flezz board could be replaced by something along the lines of “Most Flezz acgreat timesulated in the last 2 months” or something, but that doesn’t really roll off the tongue so the milestone peen would work too.