I guess it's an ambitious ask (and may not be possible at all) but I think a delta time output would be awesome.
What I mean is the ability to display the time difference between your current lap and your previous/personal best lap. So if your currently on a faster lap it would display a negative time. If you're on a slower lap it would display the positive difference.
This would be really useful for trying different lines through a bend etc as you would immediately know if that was faster or not.
I'm a little naive to the extent of the data available but if this was possible it would be awesome!