Sorry, the toggle button is only on the device itself. There are three distinct buttons on the remote as you say.
On pierogi, I can see only
power -> power
mute -> mute
Volume up -> volume up
volume down -> volume down
red -> effect
blue -> settings

There is none of the 3 input buttons, could you map them please on 1,2,3 of the keypad tab (or anywhere you please, I just thought the 123 buttons are the most appropriate)

EDIT: Now I saw it, I hadn't seen that screen up to now...
EDIT2: The secondary buttons are too far away, and that's a function I use a lot, as almost all the primary buttons are empty, please put them somewhere more accessible...