That's why warlocks are the optimal class for DPS in multiboxing instances. You can run and DPS (through dots - both instant and casting ones) at the same time.

As far as inciter - for the non MC'd fights - cluster your guys and make sure everyone's back is facing the wall - you'll have to POH a lot (mana pots for the pally is a must unfortunately). But the best part is the DoTs still tick on Inciter even if you're MC'd.

Same with the bloodelf + 2 fire elementals. Can tank-kite the blood elf and make sure to have dots on the female pally. Save SoJustice for when she mem blurs aggro. I find it better to kite her all the way to Pantheon's room since the Fire elementals move pretty slow.

Hope it helps.