[exim] support for domainkeys

I was curious if there is any intent to support Yahoo's spec for signing
email. It seems they have released libraries on sourceforge:

http://domainkeys.sourceforge.net/

It seems to be a better solution than spf, and since there is a
consensus the spf is broken, I was wondering if there was support for
domainkeys on the road map. It seems that sendmail and qmail now have
support, so it would be cool if exim was on that list :-)

Comments?