Hey Tom, good to see you found out little corner of the Internet.
I don't know if you ever saw the old "dot racing" feature of motionbased before Garmin bought them and wrecked it, but it had an option I would like to see in suffervsion. I don't remember their names for it but I'll call it "real time" and "same time". Real time plays all the rides where they are relative to each other on the road. That is what suffervsion does. Same time plays all the rides together regardless of when they actually started, so that you could compare different riders from different times as though they were riding or racing together.