sry dude, I know what descent is and I've played it(#3 I think, been a long time), I'm just explaining what DoF ACTUALLY are, not a gaming community's misunderstanding of the term(3 axis + 3 rotations = 6 DoF, not 360, besides 360 degrees is for a circle, not a sphere). I was just pointing that out because I like to use what I learn in classes whenever I can, because the responses I get are funny. sorry if I got you all hot and bothered, I didn't mean to, I'm just studying for mechanical vibrations final and trying to amuse myself because it's boring as hell, so it's something that's like right at the forefront of my mind.
As far as using Crysis to make a descent mod, you could probably do it, set gravity to zero and alter the values for the ship so that it acts as it does in descent, but it sounds like a considerable amount of work, not to mention all the weapons and enemies you'd have to code in and you'd have to get the AI to work properly with the enemy "vehicles," iirc they're like robots or something, but the AI might be your biggest hurdle from what I've heard.