proftpd +mysql + specific rules

Hi,

I install a proftpd server with mysql on a debian.

All of my users can't exit their own directory (it's normal I set Defaultroot ~).

But I want a few user can go where they want.

I realise with user UNIX with :

Code:

<VirtualHost myserver.com>
ServerName "coucou"
Port 4600
<Limit LOGIN>
AllowUser fabien
DenyAll
</limit>
</virtualHost>

But this doesn't well for mysql clients.

Can you give me a technic to do this?