if anybody is interested:
all you have to do is backup \OBDSoftware\WOFF\OBDWW1 Over Flanders Fields\ui.xml and edit the first few lines of the file as follows (edited parts in bold)
<?xml version="1.0" encoding="UTF-8"?>
<UI Units="metric">
<Colours leaderColour="0x
2F405000" formationColour="0x
2F00600C" friendColour="0x
2F204090" enemyColour="0x
2FB0201C" deadColour="0x
2F101010" neutralColour="0x
2F505050" playerTargetColour="0x
2FE0E000" missionColour="0x
2FFF98C0" aiTargetColour="0x
2F8020E0" frontLineColour="0x
2F101010"/>
<Labels mode="Identity" distanceFactor="1" fontSize="VerySmall" backgroundScreen="
n" dropShadow="n">
<Dots on="y" symbol="." colour="0xFF505050" fontSize="VerySmall" backgroundScreen="n" dropShadow="
n"/>
<MindReaderEx on="n" colour="0xFFFFFFFF" fontSize="VerySmall" backgroundScreen="n" dropShadow="n"/>
</Labels>
Also removed "drop shadow" from the "dots", making them less obtrusive and more like real dots.
The level of transparency of the labels can be adjusted from FF (=255 in hexadecimal notation, 100% opaque) to 00 (=0, 0% opaque, i.e. transparent). 2F corresponds to 47/255= 18% opacity