Thanks for the suggestion regarding coloured key listings, many other users have also suggested it and we hope the engineers are able to incorporate it.
Did you know you can already change the colour of the hot cues, not just green? The reason it defaults is the old default from CDJs has always been green for a hot cue, orange for a hot loop, so they've maintained this through to the software for consistency.
If you want to change it yourself, simply right-click on a hot cue pad in the software and select the new colour from the pop-up menu: