1. Thanks you find and remember me this tutorial.
2.
perhaps the link could be added somehow more prominently somewhere
Probably you've right!The link to the roof windows library was mentioned also here .
With out it they can't place roof windows on this roofs.
Who need it will find it. The rest don't need a virtual roof.
3. About ceiling:
3.1 @LTL81 From few versions ago, under ceiling section it is a checkbox Flat ceiling only.
Probably it depends also of the walls high and level high.
3.2 @Keet
Does anyone have an example where it really is useful considering the alternatives we have with roofs and/or other objects?
Yes. Consider that there is a multi-level house (block house) or even a single level house with few rooms.The roof could be (or not) at the last upper level.
At all levels you could set the ceiling color/texture for each room without having to make or use other objects instead.
But probably I'm misunderstand again
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A computer program does what you tell it to do, not what you want it to do. Murphy's Law
When all else fails, read the instructions. Murphy's Law
If you don't like "AS IS", DIY. Dorin's law
