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The generic remote controller is known to be outdated and not covering all possible actions.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
(http://www.steinberg.net/forums/viewtopic.php?p=253182)

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?