You can do it pei, but its not good, because it does not:
A. Let you move the mouse around the complete FOV "360 degrees of visual looking"
For some reason It only lets you View 90 degrees of each X or Y axis. What this means is that You may be able to only look completly down/up and only the Left hemisphere of the complete 360 degree circle of view.
B. You have to hold down a Mouse button down in order for the Mouse view to work, What this does is limit the idea of a "Free mouse Look"
I have tried this setup in IL2 and it works beautifully. In IL2 I have it set so that my Mouse controls the complete 360 degree FOV while at the same time allowing for the Left/Right mouse buttons to be Throttle controls.
I wish Aces High could get this straigtened out.
Pei in order for you to map your mouse to view so you can see what I am talking about, you need to open up your map view (esc key) choose "Setup-->Joystick Setup-->Select Joystick.
What you will see now is a screen that is called "Joystick Selection" What you need to do is select the "view pitch" from under the "AH control" category and choose the "MOUSE" (so you are assigning the pitch feature to the Mouse)then select the "X axis" for the pitch under the "Joystick Input" category(you do this because X is the axis where the Up/Down motion pivots on.
Now choose the Yaw, assign it to the mouse, and then to Y axis.
Make sure that after you choose the options you press "Set Input" otherwise it wont save.
I have the flu, so I may be explaining strange. (my brain is bleh right now )
anyhow.. try it see if it works for you.