HI WEMO team! Aside from the 3-way+ switches one of the other needs is something for bathrooms and other older home installations. I have two spots in my home where a single gang double switch would be needed.
The first is in the bathroom where it's one switch for the light and the other for the fan, the other has the interior lights and the porch light. One could potentially try to rip out the old gang box and put a double gang in or cut a new hole in to install a second switch, but a solution like this would be much cleaner and definitely preferred.