I saw that mouse and will not be seen alive with something like it
. Double click is a seperate action than the left click, so I still think that could be used as a fullscreen toggle action. Many video players have it that way so I'm used to it. It seems like a lot of people want to do things just a bit different from anybody else, so perhaps FPV could have customizable keys?
And I disagree with you about changing window size being atrocious, at least some times. Most times you're absolutely right of course, for the reason you bring up. It is however nice to be able to see use all the monitor's height and width without obstructing more than necessary. I've become used to it with acdsee. Maebe it could be opt in?
Are you working on this by yourself by the way?