Some of them are useful. What would you rebind them to, anyway?
Anything really. Also how about a cvar then, that disables them or enables them? I press x once they are disabled, I press it again they are enabled.
None of them is iseful because they waste your force (epic idea), stop you from regenerating, make you vulnerable and usually immobile.
All of this. The only kata moves that are somewhat useful are the big ones, and only to damage objectives. In fact that's a lie, the only useful kata move there is is the fast/medium style kata for single saber, and they are only used on bespin/urban. Everything else is just straight up garbage.
I do not think throughout my 5 years of playing siege I have seen someone unironically use the strong style leap, or the medium style jump move. Butterfly moves can remain separately for all I care, though they are also useless.
The moves I want to see disabled: strong leap, medium jump (triggered by mouse1+jump) and the crouch kata moves(triggered by crouch and attack). The rest are also useless but at least you don't execute them accidentally.