This is a fairly complicated feature to implement into ha-polymer, so I have no expectation of it anytime soon, but I feel it would greatly improve the HA experience.
Currently, hassio addonds are configured using YAML on the addon page. These are defined by the options yaml in the addon. I feel these would be greatly improved if they followed the lovelace UI system, where a graphical editor is used to edit the predefined values, and a button can be used to open the raw editor.
This would make configuration much easier for end users and can help hide the YAML for easier use of the hassio platform.