Map mode allows to reach areas of the canvas that otherwise would be inaccessible (for instance modal windows positioned in the centre of the canvas) and to modify which part should be visible by default.
Using ImGui to draw cursor helps to reduce visual error between mouse cursor and position in ImGui. But it has been reported that this works really bad when frame-rate drops and becomes unusable below ~20 FPS. Taking that into account hardware cursor seems like a better default option. Old behaviour can be enabled with ImGui.DrawMouseCursor console variable.
