Figuring averages out isnt a problem, and the only time I care about cadence data is looking for high/low points to decide if the gearing was the right choice. The actual average doesn't mean TOO much since the pace of the race/attacks/lack-there-of could bring that up or down.
I think Ill send them an email and see what they say. For me its not a deal breaker, but I also want it to be as accurate as possible as often as possible.
Ill try and get a standing start data point this weekend if I can, just to see how long it takes to kick in. I came into it expecting the 2 rotations or whatever most PMs don't get though. Id go outside and do it tomorrow but...its cold