Ability to quickly save snapshot of session to persistent groups

I love the paradigm of TO that lets you maintain context, but keep tabs unloaded. An important part of maintaining context is being able to return to that context between browser/computer restarts. If TO had a button that let you "save to session" where a snapshot of the current session is saved to a persistent session/group.

Sessions could be named "[YYYY-mm-dd] - <optional user description>", and could be sortable by date or name. The issue I foresee coming up if it was possible to save sessions over a long period of time is that the sessions folder would get massive, so some sort of automatic grouping like:

+ recent

+ year

++ month

would make it much easier to keep long term sessions stored in TO.

It would also be nice to be able to move or copy tabs between sessions. This would let you do something like create project specific sessions (a "research" session for school/work project, a "blogs/news" session for random articles that you may have gotten interested in, etc) and if you need to focus on your work and not be distracted you can save your current session with all your "distraction" tabs, and switch over to your "work" session.

The above are only suggestions for possible implementations, an extension similar to TO which shall not be named ;) implements this feature using a dropdown list for different sessions.

To sum it up, the real feature request is "more robust session management" to be able to manipulate and store sessions long term.

Thanks for the awesome extension :)