Automatic display off after reaching next trackpoint+Xm

After introducing automatic display on for guiding and navigation (btw. works great), I would like to have automatic display off after reaching the track point for which the navigation notification was given + a customizable distance after the point.

Explanation: The time between navigation notification and reaching the crossing is different, depending on speed, waiting for the slower buddies and so on.

So the fixed display off from the system settings maybe switches off the display before you did the crossing. Also out in the forest it is sometimes important to see after a crossing, if you took the right way. This is the reason for the setting +X meters after point.

Thanks