MadMonkey:thanks for your remark ... there is only one problem with this variant ... it's extremely
exciting and addictive ... and all of a sudden huge portion of your "established" knowledge about backgammon becoming useless ... same story as with regular chess and atomic chess (or any other good variant of course) ...
If this will be ever implemented I would suggest putting a  dot of opposite color on every back checker  ... this way it will be obvious where these runners are.
Cheers,
Andy.