I could not get physical buttons to work with any plugin that supports them. Thoms who maintains the OctoLight plugin figured out the problem was the new Octopi kernal not working with the RPI.GPIO library. So no one on the latest version of Octopi is going to be able to use this plugin either.
If this plugin is no longer being maintained then it needs to be removed from Octopi listing. It's been over a week since I posted my bug report for this plugin and I haven't received any replies. I'll watch this topic for another week or two and if I don't hear back from someone I'll let Octoprint know that this plugin has been abandoned.
If you are still active please let me know. Thanks