I don't see a full support class ever working in this game. They could try to be crazy with stuff the dps have though. Like give SAM a taunt that forces aggro on them and auto deflects the next hit before returning the aggro to the one that had it before(sam gain no extra hate from this). With this SAM can eat a tank buster for the tanks or if they gave it a X amount of dmg or Y seconds condition they can "tank" for a few seconds too.

In all honesty, something like that would be loved by top end players and probably hated by the lower end one as people just randomly use it(i can see this messing up DRKs seeing as it's basically TBN for SAM). Healers having such a focus on dealing dmg makes them more "support" compared to something like DNC anyway.