I don't have a lot of ideas for balancing Rage, I actually didn't bother with it on my warrior. One suggestion I have, which is not good enough on its own is that when you are Enraged, you are unable to use any skills, just basic attacks only.
Also, just a comment, but Rogues don't have much use for Rage not only because they lose dodge, but mostly because backstabs already have a 100% crit chance.
