When an operator is running modal, the user cannot pan scale or rotate, is it possible to allow camera controls while running a modal operator?
It depends on the modal operator. If it’s one you designed yourself you could ‘PASS_THROUGH’ the events intended to go to the camera. But if it’s one of the modals built into Blender (eg, Grab Tool) there’s no way I know of to prevent those key presses and mouse actions from being ignored or redirected (without modifying Blender’s source code).
Oh thank you so very much, I will have to look into ‘PASS_THROUGH’ 
Edit: Worked perfectly, thanks again.