Personally I would like to see some changes in weapons performance:
Pistols are far too accurate at long range. Anyone who has fired real pistols at a shooting range knows how ridiculous it is to try to a hit a target from 100 yards or more. Just hitting one from 20 yards is a challenge. Perhaps their damage can be reduced more the further away from the target.
Dynamite almost completely takes over some games. I have a hard time remembering reading about outlaws throwing dynamite to kill anybody. A more realistic, and I think more fun, way to use dynamite (or molotovs) in the game would be to vary the fuse. In other words, instead of knowing exactly when they go off, it could be anywhere from 4-5 seconds. A little more risk for the attacker. Or they could be made much more expensive to buy. I doubt you could get cheap tnt at the local general store.
I am sure there are others that would like to see modifications, but I don't suppose anything will change. I enjoy the game regardless and would like to thank all those whose efforts have made it possible.