Hmm, Imma supplement another Idea for kidou.
You can make a verb, that says Incantation, if you press it, it switches between an Incantation kidou or no Incantation at all.
Incantation - More powerful, more time needed to execute, more reiatsu drain.
No Incantation - Less powerful, less time needed to execute, less reiatsu drain.
Say what ya think about it.