Track chart contorl

On track's chart there is no highest and lowest gridline on axis y. It is hard to see the highest value of the track at glance. It will be useful If the charts have next gridline after the highest and lowest data point. Not mentioning that will be the accurate and proper way to draw a chart.

An other thing. It will be a nice to have feature fine adjusting the cursor position on the chart, for example with 2 buttons.