Feature Request: Session Module

Hi! What really would be useful for the session module, is a grouping mechanism for sessions, so i can set up variable scopes and share variables among different session: every session has private variables. that's the way it works now. i can register a variable to a session and there's no way to share them with other sessions with the standard php features. but what if i could set up session groups, each with a own set of local variables. i could register my session to the desired groups, and gain access to their local variables. I could set up as many session groups as I want to. This would be the most flexible solution imo. Regards Michael