Many people may be uncomfortable with only being able to close windows by button, without the obvious possibility of minimizing or maximizing windows. It would be nice to add the Extended Titlebar Buttons option in the settings, this should increase accessibility and make the usability friendlier.
There could be two variants of titlebar buttons, Simple with only a Close button on the titlebar, and Extended with Minimize, Maximize and Close buttons on the titlebar. I think these options could be in the Multitasking tab.
qa (quality assurance) tasks