Anything that makes Dante spaz out and streak across the sky's alright with me - Mustang on occasion, Flying Guards, momentum out of jump cancelled Sky Star/Killer Bees into Aerial Rave/Rain Storm.
I've always been of the opinion that the only time Dante shouldn't be drifting back and forth everywhere on the sky or the ground in DMC4 is when he's stopping to taunt which... made DmC doubly annoying seeing as they eliminated an interesting physics quirk like aerial momentum so that non-interactive background elements can float around with HAVOK or whatever and they got rid of taunts at the same time.
Jerks. Just the fact that shooting E&I or even (Somehow) Summoned Swords as Vergil keeps stuttering Dante and Vergil's downward momentum bothers me to no end. Knowing there's no recourse for all the beautiful arcs I could pull off on top of that stings so much.