[Mod Request] Non-Verbal Casting (Learned Over Time)

[babutler]

Not sure if this is possible with the current tools available but would it be possible to add an option for the player to, over the course of a playthrough, learn to cast non-verbally? It was hinted at in the introduction to one of the Griffindor NPCs and I've noticed that on occasion, the player character doesn't use the verbal component of spells when they are cast repeatedly (eg. Revelio). I'd like to see this exploited so that the player slowly stops using the verbal component altogether except for perhaps the most powerful or rarely used spells.