Hi guys… Great topic!
This is something I’ve brought up in discussion with @Ben ages ago, and with @Jim very recently.
I actually thought that arbitrary new capabilities could be created on the fly just by naming them in the "metadata{}' section, but …
So – it looks like at least a little involvement is required from the SmartThings side to update the master list in this situation.
But importantly…
(Theoretical / platform discussion moved to New Topic. Sorry for the initial intrusion.)
…CP / Terry.