Adding user defined VIRTUAL sub-mixer channels in the UC software might prove to be very helpful.
By allowing the user to create VIRTUAL sub-mixer folders the user could group the channels in a more logical way rather than simply choosing colors for each strip to identify the group the channel belongs to. Along with that a new VIRTUAL fader the user could control the volume of all of the channels that were assigned to that VIRTUAL fader.
An example would be to create the following VIRTUAL faders that would contain & control the overall features of that group.
This approach could be used to close the VIRTUAL folders & only visibly show the VIRTUAL fader until the user was to EXPAND the contents of the folder.
As a result, the user could quite literally use 4 or 5 VIRTUAL faders to mix an entire session from a PC via UC.