Very interesting! Thanks, Pilou!
I hope, Emmanuelle is seeing the new version (1.1.0), because we now have a real Burmester Curve Guide as part of the Bezier tools. It's there just for orientation, but it's perfectly to scale and in three versions (the full standard set of rulers, I believe).
Again, this is merely for orientation. While the ruler itself can snap to mouse and therefore to elements, elements won't snap to the ruler. But we may add that as an option later, too. It's mostly really just fun above all else, but to some this is a great way not to feel lost on the computer, we think!

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