Why my boy are you in luck. There was a hacky method that used software designed for wiimote emulation that was just awful.
However, In the last month, a crazy Russian hacker dude implemented mouse look (among other features). The program is called Dark Force DeHacker, and you can get it from DF-21.net (Long may it Live!). Note: If mouselook is to sluggish for you, you can enable the 4X multiplier option for faster mouse movement.
http://df-21.net/downloads/uploads/1811576435/dforcedh.zip
If anyone care about Dark Forces (DF-21 Rules! Massassi Temple Drools!), DF-21 is being regularly updated, and we even have a twitter account.
https://twitter.com/DF21net
Russian Hacker Website (In Russian)
http://ctpax-cheater.losthost.org/htmldocs/trouble.htm#df
Taton Qek, The master of masterfully inspired levels that never get released.