Since i'm a guy that wouldn't use all of these effects, i'm thinking, is there a way i can use the Shift+Reset modifier in this mapping to engage Deck C and the other Shift+Reset modifier to engage Deck D with all of it's functions?

It would be like the S4's Deck C button next to the jog wheel. Instead of the modifiers engaging all of this effects, it would simply swap to the corresponding deck according to which Shift+Reset button you pressed.