This point is interesting me too.
For the moment, I just add LDAP authentification on the operating system. Then my ldap users can connect to VMWare.
Actually, I found that assuming you're running on a Linux host, and the OS already has LDAP set up, I just had to add a couple of lines to /etc/vmware/pam.d/vmware-authd.
It now looks like:
auth sufficient pam_ldap.so
auth required pam_unix.so shadow nullok
account sufficient pam_ldap.so
account required pam_unix.so
Hope that helps.