Yeah this is a great feature and I'm very excited to explore all the options in practice mode and see what new cool tools we have to work with.
It looks like there is also a playback record feature that has 4 slots where it looks like we may be able to either record match gameplay and reenact it in practice or set AI to do 4 different custom actions on loop at random. Not sure what it does but it looks awesome.
Also TrulyAmiracle posted this in game frame data option days ago and said it also works for cancels on block vs hit. But most of the cancels are -10 it worse aside from a few at -1 on block.