Super is never worth it because his EX moves are so good. :S
You are never going to have a good enough Super.
U1 is pretty darned good already, but a range buff would help his bad matchups, increasing the effective range that he would be able to punish from (That sweet spot beyond the initial active frames of the fireball and before he’s out of range to connect). It’s far more effective offline by an order of magnitude, since that latency not being there directly effects that effective range of U1.
U2 getting invulnerability back would be hilarious, if only for it’s ability to cripple the Ibuki vortex.
I agree with Super Change to QCB x 2 + K. That’s the way it was in every game prior to SFIV. And it would avoid Super Cancels we don’t want.
When it comes to Dan buffs, I want to see normals and LK Danku buffing before anything else. If Dan had a great footsie game but still retained his “Dan” qualities I would never use anyone else (I generally don’t, but still…)
