Thinking about your post.
I use a transfer of a sheet of squared paper when I need precise layout.
It would be mega cool if Artrage had a specialised layer with various switchable templates on it.
Click for Squares, click for Infinite Perspective, click for Room Perspective, click for Story Board. Plus click for the imported grid/template of your choice.
Mostly I just draw all that stuff, but it would really help people doing architectural pictures.
Luck is infatuated with the efficient.