This would be allowing mapping Talk outputs to an “A B” system. Allowing quick switching between stage and FOH in a dual FOH and MON on one console system.
It is currently a little tedious, I think, to have to navigate to the talkback page just to change talkback output.
Shouldn’t this be possible by using scene recall filters?
Just untested:
Choose a Softkey. Let’s say, Softkey 1.
Patch I/O to your Mapping “A”. Save a Scene “X”.
Change Patching to Mapping “B”.
Set Soft Button 1 to “Recall Scene” with Scene “X”.
Save a Second Scene “Y”.
Go to the Scene Manager and edit the Recall Filters of both Scenes. In Page “Input/FX” set the Button “Patch” in the "Inputs"to “Allow”. In Page “Other” set the Button “Softkeys” to “Allow”. Set all other Buttons in all the Pages to “Block”.
Load Scene “X” and set Soft Button 1 to “Recall Scene” with Scene “Y”. Store the Scene “X” again (for such things i personally always have “store current scene” on a softkey).
From now on you should be able to just toggle between your two I/O Patch Setups by pressing Softkey 1. Of course, it would be a little easier to maintain if you map each Setup to a different softkey. Then you need more than one softkey but you do not have to store other softkey changes in all the Scenes.
I personally use magnetic photo paper to add some descriptions near such buttons on the desk surface, works well for me. In future Hardware Versions, some LED Scribbles near softkeys would be nice, but that cannot be done by software 
I see your point.
However, in a theater environment where scenes are used mid show, it would be nice for this feature to not be scene dependent.
I’ve previously done this by using a channel for one talkback - say ‘Talk A’, sending it where I need it, and using a soft key for that channel’s mute.
I’ve then used the inbuilt Talkback facility as a second talkback - say ‘Talk B’, assigning it where required, and assigning this to an adjacent soft key.
You can of course share the same input socket.
It’s also worth toggling the ‘Momentary & Latch’ function in Talkback Setup, dependent on how you like it.
Cheers!
I also like this suggestion, and would do this if able.
However, in our theater environment, I often find myself hitting the maximum channel limit constantly and can’t justify giving up dedicated channel processing for a talkback.
Having it built in to the dedicated talkback channel would just be convenient.