Buttons for Active/Inactive Inserts and Nicer L-R faders
Ardour's GUI is quite impressive as far as Linux GUI's go...however there are a couple of small things I think could finish it off a little more completely. What about an indicator button for Inserts (and possibly plugins as well) to indicate and change their state from active to inactive instead of the spindly red text. And those tiny green filaments for panning indicators look like they haven't been finished yet.
Just a couple of suggestions to "snazz it up" a little since 2.8 with VST support is going to increase downloads so exponentially (:b)