what do you mean by "switch"
He is using TGE, Torque Game Engine, which is the first in 3 other engines, TGEA and T3D. TGEA and T3D are pretty much just TGE with better graphics, easy use, and a few more possibilities, nothing that would make this ideas work.
I mean he would have to switch to source or something else, or make his own like Roblox did. I am not a master of this field at all, but judging by posts that have been made, it is probably safe to say that the engine is pushed to do all it can do.