Maybe these have been addressed before, but here are a couple things that I've thought of:
1) you should be able to trade future draft picks. obviously there could be issues with stockpiling 10 first rounders, but surely they can figure something out. anyway, i should be able to trade this years 1st for next years if someone wants to move up in the draft, right?
2) relocations should be realistic! how did the Steelers move to Mexico City after winning the superbowl? Okay, I understand maybe the Jags or Saints or something, but there should be some sort of tool that keeps good teams with history from leaving. Besides, it happens every year in my game and it just pisses me off.
Anyway, that's all I got for right now.