we should edit Authenticator like this:function GetIdentity() {
if (!session_id()) {
if ( $this->Context->Configuration['SESSION_NAME'] ) {
session_name($this->Context->Configuration['SESSION_NAME']);
}
session_set_cookie_params(0, $this->Context->Configuration['COOKIE_PATH'], $this->Context->Configuration['COOKIE_DOMAIN']);
session_start();
}
And add in appg/settings.php:$Configuration['SESSION_NAME'] = '';
So that it won't break anything in this version.
In Vanilla 1.2 we can make the installer add $Configuration['SESSION_NAME'] = 'LUSSUMO'; and advice people who upgrade to set it themself.

I guess you guys can do this. I just figured that because I allow the session variable names to be customized, there was no need for this. But since this sort of umbrellas over all variable names it's probably a better solution.