1) Good ideas.  Maybe we'll have a rouge "AI" (roughly what level we were before we came here) that is building robots to attack us?  Or do you think that would make people more hostile to us?

2) If this was a game I was designing, I would start you out primitive (late 1800s, early 1900s) and have you grow in tech level, but for this RP I'd say we have nano-tanks to assemble and disassemble things, but slowly, and a vapor-refiner (vaporize things, then refine the gas.  Fast, but misses the rarer elements.) and 3d printer (2mm - .02mm resolution) which work quickly.

3) You could hack it, but the video game company would no doubt patch any glitches we or the humans exploit.  Also, we only really have a bit more access than the humans, as we can directly understand the code being exchanged between us and the server, and the humans can't.

4) There could be other groups of AIs.

edit: added the ooc to the OP.