Interesting shortcut, kinda pertains to a one reported earlier:
If you're doing a charge.d~u+button, [DC] charge.b~f+button --and the both buttons are the same type like two punches or kicks, then if you simply do, c.db~uf press and hold button then it'll do the cancel for you. So far, only Leona and Ash benefit from this shortcut (Moonslasher into Baltic Launcer and Ash's Ventose into his Caprice).