Hi
The Merlin in the P51D had automatic supercharger cut in, this link will explain the engines performance and basic operation.
The supercharger override (break the wire) is implemented by pushing the throttle to 110% (WEP)
http://www.aviation-history.com/engines/merlin.htm
You can use the mouse to look around instead of the hat switch if you don't have TIR or another head tracking device.
The hat switch views can be edited in the GUI Input and can be toggled between snap back and locked using F9 and a combination of zooming in and out can cover most blind spots.
I find the mouse a better option
