Dynamic source MAC-NAT?

Is anyone working on _dynamic_ source MAC-NAT, i.e. the MASQ target
equivalent from iptables?

This feature is mighty useful for implementing bridges over 802.11 links
without using WDS.
WDS is problematic due to vendor interoperability or downright
unavailability issues.

Currently the Cisco/Linksys WET products implement this. Note: WET != WRT,
and WET series don't seem to use Linux as OS.

I think that Feyd was also asking for this in his unreplied "bridge
conntrack" post. His question is somewhat unclear in that he implies the
current MAC-NAT is not "real", when he probably means dynamic.

Please cc any answer, as I'm not subscribed to the mailing list.