I have been very happy with the current yoke, but there are a few things that would be welcomed additions:
1.) ability to adjust yoke tension
2.) rotation up to 90 degrees in each direction*
*I know the amount of rotation varies from aircraft to aircraft, so it would be great if the max rotation could be set at different values to simulate different aircraft (I fly Cessna 150s and 172s, and it always seems odd controlling them with the CH yoke in simulators because the yoke doesn't rotate a full 90 degrees). I'm not sure how this would be implemented though.
As for force feedback - it never felt right to me (at least in the games I've used it in). I guess it's up to personal preference though.
-Adam