I have my set to off and I can't remember exactly why. Off means it stops recordng when stopped and does not record time at rest. I know that since I use it for mtnbiking, it has to be at zero or it could be stopped a great deal of the time. It does mean that walking the bike gets recorded as distance and I don't get funny hops and skips in the route.

I suppose I could turn it on, leave it set and zero, and then know how long I've paused, but I'm not sure that I care.

Avg speed when riding door to door through traffic is always going to give you variables so just pick one and stick with it.

Editing: yeah, what Oakleaf said. Word for word.