[Soul Colossus]

Wasn't there an input plugin that made the mouse act as the analog stick and it behaved like an actual mouse in FPS games? I tried it a long time ago and now I can't find it.

 

[Zephon]

N-Rage's Input plugin can do it. You just have to configure it.
You can download it here:
http://www.ngemu.com/n64/plugins.php?cat=3&os=win32&type=pad