I'm "Luke20", administrator of Elite Force Files, the map and mod support site. RPG-X still has some players, but the community has been dying slowly since STO began. Really good fun, though, and worth downloading if only to explore dozens of starships!
Didn't really use RPG-X2 to role-play (well, seriously anyways, lol)...loved, though, running around on maps with friends and everyone set to admin (to negate the two kill auto-kick part) with the TR-116 and just exploring maps and poking the interactives (the USS Atlantis and its Mirror Universe ISS Atlantis version, for example).
One of my favorite maps was the USS Enterprise-E....the part where you can go out onto the hull like in First Contact was fun.