IPv6 support for route realm/flow attribute?

It looks like the IPv6 routing table doesn't support the realm/flow
attribute (RTA_FLOW).  Is this something that somebody is planning to
add?

I ask because this is very useful for traffic control setups.  I'm
importing routes via BGP and setting the realm based on the AS path, so
I can rate-limit outbound traffic based on the destination AS.

-- 
Chris Adams [off-list ref]
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.