I agree such a feature would be great, my issue is that capturing the viewport involves a lot of code and work on the user’s end, you have to use a custom GameViewport class that the user has to properly set in ther config file. It’s a lot of steps the end user will have to understand for the whole system to work and a lot of code on my end to try and multi thread the scene capture / bmp resizing process so as to minimize any lag to the ned player. It’s quite a Feature and will require a signnificant amount of development time to get done right, where right = 1. easy to use 2. doesn’t hitcht he game even briefly during capture (so autosaves don’t hitch the game), 3 = is properly documented, 4 = doesn’t crash ever.
I’ve been quitely processing all of the above and trying to plan the best route, so it’s definitely on my to do list 
Rama