[389-users] Enable posix attributes via LDAP

We're trying to create accounts (with the posixaccount objectclass and so forth) via LDAP, and while we can add the objectclasses and set the attributes without error, the attributes for posixaccount don't show up on subsequent LDAP queries. Looking at the entry via the 389 Console I see that the values were set correctly but the checkbox for 'Enable Posix User Attributes' is unechecked - I had thought checking this merely added the relevant objectclass but apparently there's some other special magic occuring. How can we "enable" these attributes (so that we can than retrieve them via LDAP later) via LDAP ? Manually going in via the console and "enabling" them via the checkbox for every new account is not a "solution".