Version 3.0 update adds button remapping functionality for Arms. Motion control sensitivity can also be adjusted, but it doesn't appear you can go so far as change the type of motions that correspond with certain attacks.
Full button mapping is a feature that all games should feature. Most PC games have that figured out but consoles are slow to adapt. There is some system level mapping on at least the PlayStation 4 if you really need it, but it would be better to have it on the game level to avoid having to switch it up often.