What axeraider131 wants probably actually can be done - but I wonder if it's worth the effort.
Take a look at the attached. It's very similar to the program I did earlier but I've set the camera's vehicle and point of view to the sphere that the mouse is moving through the scene. I also very haphazardly put a little scenery in the world so you can see the mouse really is controling the camera's view without having to click a mouse button - so the button is free for "fire control".
The camera response is slow in this case, but that could easily be fixed by making the spere move faster. To make this useful for a game, however, one would have to figure out where to place the reference targets that the sphere moves towards and maybe even change to another target if the sphere had moved close to a specific target. This is where I stopped with the idea the first time I tried since I didn't have any specific goal in mind.
The key point I want to make is that you
can use the mouse position functions alone to control camera position. Can this be useful - ???