It would be great if the toolbar could be customized, i.e. be able to add and remove buttons.
For example, I would like to remove the Source Control, Content and Marketplace buttons as I don’t need them. I would also like to add buttons for each of the Modes instead of having them in a drop down list.
same request
I had this same request (on AnswerHub) many years ago, and they said they were thinking about it.
Apparently, they’ve decided it’s not important enough.
I think the only way this will happen is if someone implements it, and provides it as a pull request. And even then, they may not want to support it – because they might want their special-content buttons to always be more prominent than the buttons-we-actually-use, like “build” or “play.”