Ability to keep the titlebar at other positions around the window
This is my first issue/feature request. I am unsure if this is the correct place for this, or if I should put it under VDG. You should be able to configure the titlebar's location so that it may appear below, to the right of, or to the left of a window. I think this can open the door to more customisation and personalisation options.
These are some very quick mockups I made in Inkscape, as a proof of concept.