Looks interesting indeed. But, IMO, wouldn't allowing each role to build its own chain turn actions into an overly complex mechanics? This, of course, assuming that just like you have healing and defense chains you would have one for each role and a way to "paradigm shift" the roles, also affecting the actions. This would cause, as example, an effect change as you change role like:

Stone (caster) > Stoneskin (shield) > Rasp (jammer) > enstone (buffer) > stona (healer) > WS (attacker)...and this all being effect of the same action (Stone), but affected by roles.

This way the role not only generates chain bonus for that role but also expand the actions, right? Actually...this is a hell of an idea lol! If i happened to misunderstand your example, i apologize...that was the way i understood. I think i'll even post an entry about this too...but i'll call it Elemental Trigger, a placeholder action related to an element that change based on role and, instead os attibutes, would have element modifier...like higher your fire affinity higher the potency of fire trigger.

Well, sorry that this derailed completely... ^^: