The more I see settings for the game come through the forums the more I see a straight 360 port...
(Like how the mouse is setup to be 25% faster on the X axis than the Y. So more or less, setup for an anolog stick on a controller)
This sounds like something good for me to try when I get home though, thanks for the tip!
(the mouse settings are

fXenonVertLookSpeed=
fXenonHorizLookSpeed=
They are different by default, set the to something like 1200.0000