Situational Gear Sets Help

Hello, I've been tinkering with Spellcast a bit (ok, a lot) and I think I've got the hang of it. Currently I'm stumped on something though. I can get my gear sets to work fine for WS, TP, etc but how would I go about putting in things like an evasion set? Sometimes I want to use that instead of TP but I'm not sure how to integrate that in Spellcast. Any help is appreciated