ToS, PoM and Demo are a bit superflous. All three give green heals, PoM and ToS blue heals. Better setup would be 1 ToS, 1 Demo and and extra Necro or sth.

I've multiboxed several things, but "real" 6-mans could be pretty tough. "Easy" things like Atzel and Onyx can be done e. g. with a DT and a ToS (multiboxing). It's pretty fun btw. That way, everything takes a lot longer, but that actually gives you time to actually see graphics and mob abilities much better.