(had a look and can’t see this as a current capability)
How about the ability to change the colour of a Panel widget either in response to GP Script or to an OSC message?
As this widget is one that can be any colour it might be useful to use as a large indicator for some thing happening - e.g. setting it red when an instrument is bypassed, or based on the playing status of the transport.
I think it would be cool anyway!