When I mark a track in the project window it also gets highlighted in the mixer, but the difference in colour between highlighted/non-highlighted is quite small so it’s quite hard to spot the track quickly. This gets annoying in the long run if you are making adjustments to many different tracks frequently (like typical mixing work) and each time you have to strain your eyes to find the marked track.
I think the easiest way to do this would be to make the highlight of the selected track more visible, ie. stronger contrast to the default colour, perhaps with a user definable slider. Another way to do this would be to automatically scroll the selected track to the middle of the mixer, allthough I’m not sure how this behaviour would be implemented on tracks which are far left/far right since at present state they can’t be scrolled to the middle.