the new feature request would be to increase the sensibility for markers beyond the points shape limit, as drawn below:

In blue color are the points with their conneting line; in pink color are the sensibility area surronding the points.

If sensibility areas are distinct and user click on point or in its surronding sensibility area, user will get point marker with point value.

Thus, this feature should ease point marker selection, without the need  to tap the exact point with great accuracy.