I love the idea of the mode button like on the new hap AC2. Should the issues with that particular router be resolved, I plan to purchase one and attach a script to the button that will enable/disable my guest wifi.
I would also love to see the mode button functionality expanded. For example, a different script could be executed when the mode button is double-clicked, triple-clicked, or long-pressed (for example, for a long-press I would attach a script to gracefully shut down the routerboard). Maybe the WPS button could also be reprogrammed to act as a second independent mode button?