For now, I have added the management of the recovery of the value in the Zigbee PR.
Instead of having the values single, double and long, the state will be 1, 2 or 5.
This allows you to use them in scenes 
@lmilcent Can you test the new image?
As previously mentioned, I would be happy to work on the UX and propose a button that is easier to use in scenes (and for display in the boxes) + standardize between the Xiaomi service and Zigbee2Mqtt (the only services using this type of device button).
But I think it’s better to do this in another PR and above all, I would like to share specifications here before starting 
To add a Light feature instead of a button, this seems too complex for now. I would need to keep the real Zigbee type and the Gladys type of each feature to be able to convert the values AND send actions to Zigbee (which is impossible for these devices).