Well, the existence of an edit button aside, still no disappearing mouse? Also, still with the calibration point?
You can replace the calibration point with Arty's auto-calibration script inside of Air Ace. You can make the mouse change cursor images (To something perhaps invisible) with a script inside of Arty's Mouse Maze Mania.
E button causes crash. Code not very efficient but eh. At least most of it works. Seems you've sort-of-fixed the recalibration problem by making it possible to recalibrate by pressing Q.
By the way, if someone's window is resized, the mouselock moves to the left. Your collision detection of detecting the object under the mouse won't work then, and other problems with that method have been noted, such as a hit not being detected until after the mouse is let go of. Though you're not even using it, so that's just odd.
As I've said, I don't really do world reviews. I don't expect this to be have been something that was made to be reviewed anyways. The most you can expect from me is to nitpick at all of the problems the world has.
Edit: That is a really lazy reload animation. Here's a video you should look at.
http://www.youtube.com/watch?v=km5KqN7ywAw
Good anims for the Finnish RK-62 by some Finnish guy CryDEV calls Olli. Two different reload animations, one for partially loaded and one for empty.
http://www.crydev.net/newspage.php?news=81887
GREAT anims by a guy developing a multiplayer shooter. Best seen instead. The guns used in the video are repurposed and edited with permission from Counter Strike makers.