In almost every project I do, I wish there were a role that could create/edit/delete all content AND manage menus and widgets. Other roles this might person have would be add new users (but maybe not delete or change roles), moderate comments.
The real-world case for this role goes as follows:
A technical admin installs WordPress and then manages plugins, themes, and settings.
An editor creates and edit content.
The problem case is when an editor creates new content but then cannot add it to the menu! Similarly, managing widgets is often closer to content management than site administration. Comment moderation is the same, and even user creation is sometimes more an editorial duty.
Having this role would make my life better along with anyone else who manages a medium or large WordPress site. I've talked with many other people who want this exact same role.
rsteer 
