In theory limiting the ways to gain edges might be interesting. Gain a small amount of edge points for leveling. For Pking as well (though I think that hinders some characters and not everyone is as PK focused and so I think that is why you have obs/exp as compensation for those who don't PK or not well)

Immteraction would be a great one, but I think there is lots of roleplay that goes on, and you'll almost never get imm xp for it. Stellar RP enhances the game, and maybe if it is in the presence of an Imm you might get a little imm exp (Lasentia got it twice when Cyradia and Enlilth came to the inn for random little RP sessions) but if you spend 2 or three hours rp'ing with other characters, 99% of the time you're doing it for the fun of it, you're not going to get any sort of reward for those things.

Leaders I imagine spend countless hours rp'ing with applicants and cabal members, but they're not getting any rewards for that, even though they could be out pk'ing or something where they might gain an edge point or two. It's part of the duty yes, but I don't think there are enough Imms to monitor general character RP to the point where you can make imm exp a major part of the edge point system. Imm xp for roles is fine, and I like to think most people do play out their roles and so the imm exp for the role is kind of a general reward for their overall rp since the Imms can not be ever watchful.

I would not mind a shift in people having fewer edges overall, but edges doing a bit more. That way you're more selective in what you do with them. I know I can explore a lot, have a decently written role, and by hero I can take about 5/6 top tier edges and a few others pretty easily, so deciding what to pick is almost trivial. But if I knew I might only be able to choose one or two of the top edges, that could be interesting and I might make the decision more carefully. I also don't want to reward the top pk'ers by giving them edge points (even on the A-P charge system) since they would get those added edges that the less elite players would not be able to cause they can't PK as well.

Overall, the system works. If you want edges, you can do the PK route, but the obs/exp route is there for everyone to make use of, and it is capped so you can't really exploit it. And I also like rexploring areas, but I haven't played for 5-10 years so I still see some new things most passes.