Having the mouse move the gun cursor a bit before rotating the player was used in a couple of PC games I think, I'm not really sure which. I just remember someone making an addon for gmod that did it. It's actually supposed to be a more realistic way to aim, real people don't rotate their whole body a few degrees to the left to shoot left, they just aim left.
That being said, I like the way it's been done for years. Move the mouse and you turn. I'm used to it. I can't really stand joysticks for controlling an FPS either. I tried it at a friends house (I got him through the ravenholm chapter in hl2), the whole game just felt slower. Everything from walking to turning to shooting just seemed to take longer.
Also thread title says warefare.