Always on Top
Modern Mix needs a feature to allow you to flag the window for any modern app as "Always on Top" or "Stay on Top." Some native desktop apps have this ability (Windows Media Player to name just one). I want to make Netflix a little window and have it stay on top of the other windows so I can watch it while I do other things.
There seem to be third party apps out there that can let you do this to any window (why isn't this just built into windows by default?) which I will try in the meantime but since I have no idea if they'll be compatible with the Modern Mix windows it would be nice if it supported this natively.