I use a single theme for all my multi site sites and a few plugins. It would be very handy if there would be an super admin menu for hummingbird where I can set up all settings on a theme or plugin basis.
So for example hummingbird knows which files (CSS etc) are from which plugin or theme.
After that I can say: Ok for this theme or this plugin always minifiy these files and load them in the footer.
Are you planning to make such a feature?
This because my users don't understand this plugin.