I'm interested in setting up my priority inbox with 5-6 sections, but Gmail settings limit you to 4. I've found this alleged settings hack to add additional priority inbox sections; however, I cannot get this to work.
If you inspect “Remove Section,” and change the corresponding act=”z” snippet to act=”n” (highlighted in the image below) and then click “Remove Section,” this will add another new section!
There doesn’t seem to be a cap on the number of sections you can create through this technique, and these changes will persist for future browser sessions just like the Unread trick.
I'm not sure if this still works, or if the snippet needs to be updated based on some Gmail updates.