<<The idea is that you're maneuvering around your foe in a way that prevents them from bringing their full numbers to bear on you. That seems well-suited to the Tactics skill.>>

I like the general train of thought here, if not the specific implementation suggested. I don't think you should have to land attacks and complete a combo in order to maneuver into a better defensive position. I'd rather see a stand-alone maneuver in the same vein as WEAVE that removes (or lessens if you're not quite so successful) the target's ability to inflict or benefit from the multi-opponent penalty for a little bit. To take it a step further, there could be another tier to it where if you do it again to a target that's already been affected, they're blocked out of being able to get at you altogether for a little bit (other opponents are between you and them). We could call it ISOLATE or something.

If it has to be a combo, I'd suggest that it be a purely tactical combo (you have to land a circle, bob, and weave or something).

Thanks,
-Life Sustainer Karthor