If I understood correctly there isn't much hope. For a moment I just dropped the idea ofr storing full names into ISC4 and I restrict usernames to A-Z ad 0-9.
I store the full names into my own database.

Riho-Rene Ellermaa
senior programmer
Hansabank

>
> Sure, it's "just" a matter of offering a second version of
> isc_add_user and
> isc_modify user that can take a charset as another argument.
> This is the
> easiest route. The problem is that those calls are officially
> deprecated in
> favor of the Services API. But not much people like the Services API,
> therefore...
>
> The other way is to push the charset into the Services API so
> the new API
> calls to control users can work with charsets, but this is going to be
> harder to achieve.
>
> C.