Hello Stefan,
a very belated thanks for your patches regarding libtiff and krb5, which I just merged for Core Update 169, to finally cure all the missing dependencies we have for some executables.
As for Kerberos support, I do not think it is too pressing to add this to OpenSSH et al., and would be happy to review any eventually incoming patches, but do not feel a rush on this end.
All the best, Peter Müller