I don't see any point in having feedback from actions.., but rather the feedback comes from what ever the action is acting upon. For example if you send /action/22 to REAPER which toggles track1 mute.., REAPER sends /track/1/mutetoggle.., that's the feedback.
As for the multiple devices issue.., I think what we need are actions that toggle the state of Receive and of Send for each control surface listed.
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