Firstly I would really love to have some options for different coloured faders for different layers/functions (like an analogue desk).
For example Buss faders yellow or green, Mix fader definitely red; FX faders blue. Ideally user configurable - but I'd be happy even if it was just set or a few different fixed options. The idea is to be able to see at a glance what you are looking at without having to squint at any labels.
The same goes for the idea that the shade of the background changes when you are looking at the sends on faders; to for example a lighter shade of grey.
These visual cues can be life savers when you are working under pressure and you're tired - and in every day general use make things more intuitive.