I know this has been mentioned before, but I wanted to bring it up again. A combine session tool, though small in it's usefulness would allow a TBL for the day if you could let's say put all the laps from one day into one session. This would help on those weekends where you may only get 2-3 cleans laps before traffic and would like to combine the sessions to see how the TBL would have been had you had a session with lots of clean laps. I don't see how else it would be beneficial other than that, but that IMO is worth it.
I really hope this is high on the list of priorities, or that I haven't missed it.