When you have only your Nas4Free PC as central machine 24/24 and only around clients linux,
I think it's cool if Nas4Free can run a ldap service.
In this case, you don't need buy and make another PC only for this service.
Why not install in Nas4Free ldap service ? I think it's just ldap service on FreeBSD and an interface to start or stop this service.
Not interface to add users or something else (perhaps in console), but we can install interface in php to manage ldap or use another PC client for this.
Stupid idea ?
Thanks for all your energy for this project.

