Generic Remote Controller - Hidden Actions - Center Panner

The generic remote controller is known to be outdated and not covering all possible actions. (even in the lastest

However it is possible to edit the xml file directly to use values that are not selectable in the Cubase Editor.
For example “eqs/band3:type” to change the EQ type.

Is there a list with all the possible values/actions? or a way to find out what options are hidden from us in the editor?

Is there an action to set a remote controller button to center the channel panner?