Steadfast really only makes one difference, AoE or no AoE. I find Steadfast to make the battle more interesting because there are times i want to AoE a group and others that i do not due to the possible gimping of the next group. There is so much more to being a MRD than just getting in Steadfast. I think that making Steadfast into a toggle feature will, in a way, stunt the skillfulness of being a MRD.