DnD markers behavior should have preferences to control at least color, because at first sight I would prefer different color scheme. Red for possible positions and black for position where dropped element is going to be inserted.
Here option candidates:
1. Show Possible Drop Markers : Yes/No checkbox
2. Possible Drop Location Marker color: Color Chooser
3. Drop Location Marker Color
4. Highlight Drop Target Element: yes/No checkbox
5. Highlighted element Border color: Color Chooser
6. Highlighted element Background color: Color Chooser
7. Highlighting Transparency: 50-100%

In DnD captions (JBIDE-5970) would be good to have preferences to let it be controlled. Something like:
1. Where to show caption: VPE ,Eclipse Status Line
2. Where to show if VPE is selected in point 1: Align to Cursor, Highlighted element or have it always at the same fixed place.
3. Show the code after DnD is finished in caption: Yes/No
4. Font color: Color chooser