I noticed that there is a system for automatically hiding overlapping GeoPlaceMarks. But I'm wondering if it's possible to disable this, either globally, or for individual marks?

My application in a flight control system, and I'm using a Marble map with GeoPlaceMarks indicating the aircraft's position, and positions of waypoints and other points of interest. Right now the aircraft tends to disappear when near a waypoint, which isn't great.

Any suggestions?