For #1, this is definitely on the "To Do" list but I don't know how soon we might see it.
For #2, I don't know whether the UI people plan to add this. Probably you are familiar with add-ons like the following that list your tabs in the sidebar:
For #3, that would be nice for pages with interior scrolling regions! There are some bugs on file for this, but not very active recently:
For now you might need to continue using an add-on.