Yes, I seem to recall writing one or two posts there.

I believe some EBers (other than me, that is) have used the Ludus Magna in the past. QwertyMIDX for instance, e.g. this thread.

It's a shame the Game Mechanics forum idea hasn't been extended to M2TW. I may be biased, but I always thought it was a helpful place and a useful addition to the Org's forum line up. IIRC, there was a pinned thread dedicated to mechanics research in the Citadel, but all I could find after a brief search was a indirect link or two in econ21's excellent M2TW FAQ. Oh well.