repeat wifi signal with external router

dear all, matthias,

i'd like to repeat and strenghten the pi-rateboxes wifi signal through an external router in order to make it available for the neighborhood. i have found out about WDS wlan repeating, where both ends need to know the mac address of the other, and have managed to configure the external router accordingly; but now i'm kind of stuck. how should i configure the pi-ratebox and define the repeaters mac address there without damaging the piratebox functionality?

thanks! (thanks for the whole project as well)

uwe.