Ok, I've pushed a quick update to Pierogi, which should be in extras-devel soon. I'm still not sure I've got the Panasonic protocol right, but with luck, this time the discrete inputs should work. (Also, the "Aspect Ratio" button on the Utility panel, which is also using the same sub-device number.)

Honestly, my problem is that I've got two slightly different descriptions of the protocol, and the config files I've got don't seem to be using either of them. So, I'm kind of guessing here. I'll have to do some more research to determine exactly how this protocol works.

Also, I think the reason why the dropdown menu choices weren't doing anything for you is due to my UI design. I couldn't fit all the discrete input options into a single page of buttons, so I decided to place all the choices into a "combo box", letting you pick the specific option you wanted. However, in order to correctly mimic a remote control (which will repeat a given command as long as you hold down the button), I also created a separate push-button control. So, in order to switch to a specific discrete input, you first need to choose your desired input from the combo box on the bottom right, then press and hold the "Change Input To:" button on the bottom left. I'm sure there's a better way to do this! If anybody has some good UI pointers for me, I'd love to hear them.