Also engineer classes. I wish to farm salt as a Techmarine with a Plasma Gun while my automated servo-arm backpack keeps the Rhino from exploding, because everyone loves the Apothecary doing essentially the same already. There could also be room for fun gadgets, as per DOW2's multiplayer techmarine (landmines, EMP nades, shield generator, target designator) so he stays relevant away from the boxes. Also space-HESH because sometimes the vindicator isn't there and you really have to demolish something. Hell just make something like this with a 150mm gun and I'll buy it day one. Better than two sticks and a rock, and I'd trust my life to it even 37,500~ years later.