Yeah it doesn't make sense to me why it's an advantage for RedHat to selectively backport patches instead of keeping up what the developers believe is a stable API for all callers. It's the same corporate cargo cult they were in when they made the mod_perl1 "compatibility" interface for Apache2... just made life harder for everyone in the end, if I'd wanted to use 1.3 handler API I would have installed 1.3... but that is ancient history.
Oh they give the 2.0.43 as an excuse at http://www.redhat.com/security/updates/backporting/?sc_cid=3093 .. but what actually makes code stable is fixing the code, it's bollocks.
Mark