Auth package reloading config files and session

[aaltes]

We're trying to set up simpleauth against several user tables. We're doing that following this approach:
-we have a single simpleauth.php config file
-default config
-we override user table configuration property in runtime

It works fine in the login action, but on next requests session loses user information.
Please see details in:
http://fuelphp.com/forums/discussion/12918/simpleauth-logged-user-not-saved-in-session