central management of ssh public keys

Hello,

I have been looking for a way to centrally manage our growing list of 
openssh public keys. Currently we have around 200 users which all 
authenticate to servers using public key authentication (each with their 
own key). In this case the management of this becomes seriously 
tiresome. We have tested the GSSAPI functionality within openssh and 
found that the additional management of the kerberos was something we 
did not want to deal with. We have since found the following patch

http://dev.inversepath.com/trac/openssh-lpk

It seems to be exactly what we are looking for, it removes the 
requirement to have kerberos -> ldap or active directory in a totally 
UNIX environment. Does anyone know if these patches will be introduced 
into the mainline openssh portable code? I notice that the patches have 
been available for some time. Has anyone heard anything about this or is 
it a pipe dream.

Alternatively what other solutions are available to manage keys on a 
large scale?

Regards,

Jimmy.