[turba] shared address book as default

[redaktion@akweb.de]

In a small installation, we want to use one shared address book for  
all users. In IMP 3.x we had owner_id commented out - worked fine. In  
IMP 4.1 we set up a localsql source (eg. "SQL Address Book") and a  
share with all rights for all users with a different name (eg. "Our  
Address Book").

What I now want to do is setting up a global preference, that the  
later is the one and only address book, which is preselected for all  
users. The Turba pref

$_prefs['default_dir'] = array(
     'value' => 'Our Address Book',
     'locked' => false,

does not work - in the new contacts and search screen, I get a drop  
down list with "SQL Address Book" as the first and "Our Address Book"  
as the second entry.

What to do?

Jo