[Mediawiki-l] Default Namespace

[elc pub]

Hello !

Here is what I would like to do :

1. When a user logs in, I would like to put him in a Namespace called FOO by
default instead of "MAIN". Is that possible ?
2. When a logged in user wants to create a new article, I would like to
place that article in a Namespace of my choice. Is that possible ?

Any help/pointers  would be appreciated to this newbie.

Regards,

elcpub