Sub-Session Groups (Folder-Tree Style)

I'd like to see the Session Groups enhanced to support sub-groups. I'd also like to see the option to "automagically" sort that list alphabetically.

Reason: We have a large number of customers in our Session groups, and some have a number of groups due to the client size (and for ease of finding servers, or a department, etc). Just finding a client in that list can be a scrolling challenge. It would be great if we had a session group for the client, then collapsible sub-groups (just like Windows Explorer, if you will) where we could create groups for servers, this remote office, that remote office, etc. Overall, it would just help keep things a little cleaner.