The only things that I can think of atm would be margin from windows edge (if possible.. ), color overlay (if designing a white frame that can be colored in post)
Alright I will check out what is possible to do for frame customizations, I have not really looked at that myself. Thanks for the suggestion 😁 it makes me think that people might want to customize the arrow sprites too for windows that scroll. I will look into both of those things.