IPv6 routing type - not at par with IPv4 one?

~ # ip route add throw 1.2.3.4
~ # ip -6 route add throw ::1.2.3.4
RTNETLINK answers: No such device
~ # ip route add blackhole 1.2.3.5
~ # ip -6 route add blackhole ::1.2.3.5
RTNETLINK answers: No such device
~ #

The reason for this is in net/ipv6/route.c - ipv6_route_add:

Eventually code winds up at this (1423 line in 3.5.3):

	err = -ENODEV;
	if (!dev)
		goto out;

and poof, ENODEV.

Is there some reason for this? Or should I write a patch? 
Or does someone else want to? Support for dev=NULL 
elsewhere in the code seems to be ok.

Based on quick googling I'm not the first one to have encountered this.

Cheers,

-Markus