I set two buttons up

/stopcasting
/assist "main"
/cast "Dispell" (or whatever the spell is)

the second button is linked to my poison removal
I have 2xmages, priest, shaman, pally... it is working pretty good for now and I just set up a brand new /castsequence system. All of my buttons went from 1-+ and f1-f12 down to 1-4 and f1-f8. (f2-f8 is all heals and cleanses, ect)