Add ability to delete apps from library (not just uninstall)
Trying demos is nice but then the demo is stuck in the library even if you uninstall it (in the "All" view), cluttering the screen with old demos that I don't care about anymore. For example, SUPERHOT Demo is always there beside the full game which I purchased afterward. I prefer staying in the "All" view so that I can see which games are available to me, installed or not. With demos cluttering the "All" view, the only option to hide those uninstalled demos is to stay in the "Installed" view, which does not show the big picture of what my library truly contains.
The "not installed" view also gets cluttered with tons of old demos and it's harder to find what you're truly looking for in there.
It also triggers some people's OCD... !