Are you happy with the current UUM? Any thoughts on changing the tier system that was talked about before? On IR, we've disabled iron/diamond/redstone and coal from uum to help balance things a bit.
Any thoughts on end game content? If readding the force field is desired, what are you trying to keep out? With a Qsuit or anything else, the need the field is basically pvp only and not many servers using IC2 that I know of are pvp.