So, I'm making a mod so that if you hold down both mouse buttons while wielding a 2 hander, You'll hold your weapon off to the side and cast a spell with your off hand.

What I was planning on doing is set it up so that you'd switch to the 1h+spell animations while engaged, and then switch back when you finished.

One problem I've been running into, though, is how would I add additional casting sources?
I was going to make a perk that added an additional slot that could hold spells, and when activated you'd draw from that slot.
I can't for the life of me figure out how to do that, though.

Any suggestions?