Enhancement: Dark colour scheme (inverted display) for the canvas
Please add an 'inverted display mode' (see UI mock-up). This would make this awesome program so much more powerful for everything CAD related. 'Inverted' simply means negative, be it b/w or colour.
Without this, any dark theme for the UI doesn't make much sense as it just raises the contrast between canvas and tool bars. All major CAD software providers offer such a setting.