I would like the ability to choose icons for my Rooms.
You can, sort of.
Go to the “room” then press the gear icon in the top right. You can Set room image.
you can put an image of anything on a room. just put the image in your camera roll, doesn’t have to be a photo. could be a screen shot of the icon you want. you can crop it once you add it, but it will be the shape of the circle.