Mouse support for 360 never will happen. Not in this generation. All you can do is hook up a USB keyboard for certain functions (the annoying softkeyboard for entering values pops up anyway if you do so), but a mouse is not supported by the 360, at all.Originally Posted by ToaTheBoa
A workaround is a device which turns mouse signals into controller ones, like Smartjoy Frag and others.
Search youtube for "smartjoy frag", I cannot post any links here.
You can find a demonstration of smartjoy frag, and other devices can be found in the related videos I think. From what I remember, back in my Halo2 clan days, it wasn't really that good due to input lag. But maybe newer versions work better; and after all, using it for editing levels isn't so demanding as when used for playing shooters.