It would be awesome to be able to group spaces into different sections. I know, it's something not that 'wow', but it could help a lot!
Let's say in our company we have different "types" of work: Internal and external.
Internal: All common departments such as HR, Marketing, Finances, etc...
External: Projects (with clients). This applies very well to us because we're a consulting firm.
It would be great also to customize these names, as it happens with folders. (ie. Section 1 is called "Internal use", and section 2 is called "Projects")