after googling i've found many threads about this issue

http://utforums.epicgames.com/showthread.php?t=605871

http://forums.epicgames.com/showthread.php?p=25388211

http://www.hardforum.com/showthread.php?p=1032232854

http://utforums.epicgames.com/showthread.php?t=588887

but which solution from these provided is the best one ? i just want the mouse to feel as close to ut2k4 as possible even though i know this game uses a different engine