1. There should be a separate menu option to start up the session manager and it should not be accessible by default via the menu option "session - new session". This method is counter-intuitive, sometimes you want to simply view existing sessions or edit existing sessions not create new sessions.
2. I prefer the term "site manager" rather than "session manager" as a session implies a currently running session, that term should be reserved for current sessions. The site manager list contains the sites that you could connect to in order to create a session.
Regardless of the name, the menu option "session manager" or "site manager" should appear in place of "session" and clicking on it should start the session manager, the sub-menu options could remain.