Unfortunately, Ben's answer no longer works. I've done some investigation into making this possible again, but don't have a full answer yet.
In the settings, choose Priority Inbox, and click Save Settings. You can see the network request it makes request under the in the developer tools. In the request payload, the settings for priority inbox are under
184.108.40.206.2.88147817.181538083.7.2. It will be a list of four items for the four inbox sections.
1 property of these items is the type of the section. The available types are:
7 = ...
8 = Important
9 = Unread
10 = Important and Unread
11 = Starred
12 = ...
13 = All Important
14 = All Starred
15 = All Drafts
16 = All Sent
12 are special.
7 represents "everything else", but it is removed from the list unless it is at the end.
12 looks at the value in property
2 to determine what it does, and the values for property
2 can be the values in Ben's original answer!
My goal in this investigation was to allow me put the "everything else" section in the middle, and I was able to accomplish that by using
^i in property
This is not, however, a full solution to the original question since the
2 property does not seem to allow commas. Hopefully this can be of use to someone, though.