[B.A.T.M.A.N.] using gateway of other node, instead local gateway

Hi, I have a node that uses its own internet connection to establish a vpn connection to another node. Therefore the node has a local default route. I have setup my policy routing in that way that all public wifi packets should be routed through the vpn connection. These packets should not go through the local gateway. The wifi interface and vpn interface are under control of batmand. (batmand -r 1 vpn eth1) When I call batmand -cd2 I see the gateway that is offered by the other node behind the vpn connection. But no default route (bat0) is present and I also can not use the parameter "-p" to select the gateway. How can I tell batmand to use the best gateway when the current node has a local gateway that should not be used by batmand or the batman-network? I'm running batman-exp rev1066. Regards /Stephan