I’ve just realised that I would like mixer tracks to be more easily distinguished. The coloured Fader Caps were a good step down the road but if there is a will to take this a stage further then I would like to see the track backgrounds, currently identical grey, take on those colours too (with a pref, of course! 
), so you would end up with Green on Dark Green, for instance.
I think it would make the Mixer much easier to work with!