Elevation graph scrolling

Swiping one's finger over the track elevation graph left to right (or vice-versa) could scroll the vertical position marker line. It would better illustrate the continuous altitude change of a track with changing altitude (gradient, speed) dot and value shown while moving horizontally.

Now, one can only tick on a position and tick again and again...

Problem: as it is now, the graph scrolls as a whole while swiping if zoomed.

Maybe that effect could be kept by swiping on the 'Distance' axes itself, while swiping inside the graph would move the vertical position marker line? Or the vertical line could be sticky when select-and-moved.

Hope I made my point clear: English is not my mother language.