In Garmin connect one can select a range of an activity graph. For example, I am heading to Central Park, and I want to select from the moment I enter the CP loop to the moment I exit it, 2 laps later. Right now you can do that selection, but the calculation of average speed, and other metrics, is not recalculated for the selected range. Strava does that in a very neat way.
Please, implement such calculation.