That is a shame, limits its usefulness to me, at least. If I'm trying to figure out where my codriver got me by 0.5 seconds, it's really hard to tell when the runs aren't synced from the start.
Yes, I can set my own start points precisely in pre-upload editing, but that only helps so much. Say I want to see who did 'x' slalom better in the middle of the course, or maybe I want to compare my video to the local hotshoe that isn't too computer literate and uploaded his entire video from the moment he turned on the camera? (

) No go.