There are definitely kludged drivers for the PS3 sixaxis controllers for Windows now. I think it's called MotionInJoy or something. And some third-party PS3 controllers even have manufacturers' drivers; I have a PDP Afterglow controller and it's plug and play in Windows 7.
I would love to see almost any kind of space sim as long as the production values were excellent. The genre is stuck in a rut right now where if some company makes a space sim, it's a half-assed POS because they weren't willing to put true heart into it, because they don't think there's any profit in the genre....but, because there haven't been any truly remarkable space sims in a while, interest in them is at an all-time low, reserved for people like us who refuse to let go. Statistical anomalies.
As far as the engine goes...really, it's a choice of time or money. License a well-known engine, and it skips the process of coding it from scratch and you get all the documentation for it, as well as the option of taking a look at other games made in that engine, seeing what works well and what doesn't. I really think that a few universal engine is what will eventually revive the PC gaming scene, but I'll save my soapbox rant on how dumb it is for companies to keep stubbornly making their own engines because of pride (Bethesda, cough cough ) for another thread. Of course, using the FSO engine would be ideal, because all of you wonderful and dedicated FSO people have massive amounts of experience in it, but would a commercial, for-profit venture using the engine even be legal?