Warwick's R
Simple, really. I understand the deal with CC effects and movement abilities... but I think that suppression should be a move that cancels movement effects. It's just a little silly to me when WW ults an enemy as they dash/jump/etc to safety and then is left ravaging... nothing. While the damage and the CC still apply, when you aren't in range after it ends to follow up or they jump to the safety of their allies or turret, it sort of defeats the entire purpose of his R.
And that being said, while I understand while he can't cast skills, I think his W at least should as ignite does. It's an ability that doesn't cancel your action, so you should be able to use it even during your R. It's easy enough to use it before you go in or right after, but I think it would be nice to be able to use it during so that you don't miss out on the duration of the AS buff and your teammates don't miss out on their chance to demolish the target under WW(or held by an invisible force just a dash away while WW furiously claws the ground).
Just some thoughts, I don't know for sure if other suppress abilities deny movement abilities, but I feel like they do--and if not, should.