In reply to Adrian Lyons.

What about adding an extra button to show/hide additional menus..? I mean if I’m looking for core items I agree that plugin/theme menu items can be distracting… but vice versa.

So some way to switch between three “menu states” would be even better: core items, plugin/theme items, and combined (default.)

Would be simple enough to do by adding a few menu classes automatically (if needed) and some button interface and simple javascript function to change the display states.