Editing camera settings just does nothing or even worst it’s quite random the behavior. If you try to change the camera settings nothing happens while the Capture Aircraft tool is open but sometimes if you exit and enter back the hangar than some changes are applied but again you cannot change them again in the edit camera. If you change the camera to an internal one than back to an external one the camera is stuck in the internal view. If you change the camera settings and you enter back the hangar than the standard view is changed using the latest Aircraft Capture view settings even if the tool is closed
I understand why no one is actually using it
I did some testing with this tool on 1.37.19.0 and was unable to replicate the issues you reported.
I was able to create both cockpit and external shots, switch between them, edit camera settings and switch between tool and hangar context without any side effects.
The only issue I encountered was the X/Y/Z axis sometimes being odd depending on the selected camera type.
If you are still facing issues with this tool on the current build, please update this post with more detailed repro steps or possibly a video demonstrating the problem.