Great App but some suggestions...
I really love this Application, but had a couple of suggestions for it.
1. How about the ability to quick resize?
Like hold in "Alt+ctrl" and then use the scroll wheel or - and = keys to size.
2. A hotkey to disable it
How about a hotkey to quickly dis/en-able the program, like "alt+ctrl" and then spacebar or something. What would be better is to have the user be able to assign it.
3. Perhaps have the ability to disable the Viewport with a hotkey, so you could have a screenshot you took just before starting the program as the background, then hit the hotkey to disable Viewport and it looks like you're doing nothing out of the ordinary.
But those are just suggestions, the Application is great as it is.