Problem with Waypoint Dragger

If you queue up buildings in narrow space while zoomed out, build orders are overwritten by others or their position is changed. This problem seems to be only caused by the Waypoint Dragger widget. I still use it, because I find it very usefull in other situations. The solution would be to deactivate dragging while a new building to build is selected. This would also make it easier to delete build orders on purpose by queuing buildings at the same place.