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Description
Frequently I want to be able to drag around the icons in the toolbar for an editor. These are the buttons corresponding to a subset of menu options. E.g,. there's key buttons I very frequently click, e.g., "Close and halt notebook" and want that first.
It would also be nice to be able to set a color, and even customize the description text.
I had planned to implement all of this last year and didn't get to it. I find myself wanting it frequently and also feeling I would be more efficient with this functionality.
What would the UI be like? Here's my toolbar for Jupyter right now:

Imagine adding a "..." that is floated to the right of the toolbar. When you click it, it has:
- all the menu items represented in the toolbar but fully spelled out and selectable. Thus this is your "favorites menu", which is itself a nice thing to have.
- in this favorites menu, there is a drag handle to the left of each menu item, which can be used to reorder the items. This ordering then applies to the toolbar buttons.
- next to the drag handle, there is also a settings gear, which when clicked shows a modal with a color and title selector, which lets you change the color and title of a button.
That's a ton of work, but would be very useful.