It would be nice if sections could be grouped liked fields.
We have 3 different sites with a lot of sections. Unfortunately, the sites can only share a few sections.
The list of sections is therefore very long and confusing. A grouping would significantly improve the overview.
The ability to change section ordering would be helpful, too.
Section groups could be useful even when there's only one site. For instance, I like to create Singles for every page including the account pages (Login, My Account, Order History, etc.). Those could all go in an "Account" group. I also often have multiple Channels or Structures for various types of categories, those could all go in a "Categories" group.
That's why I prefer to have a single Pages structure section (with several section types) instead of a bunch of Singles - grouping and ordering come built-in and all the "navigation logic" is stored in one place.
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The ability to change section ordering would be helpful, too.