Rulers works well in DTP applications and sometimes I have desired to have it in PlotMaker (even in ArchiCAD). I don't know how difficult would be to implement that in the new developements, but I think that the ability to define visible but non-printing layers would be a useful and easy way to do it.
In ArchiCAD we use the .aux extension to define non-printing layers, but is only an internal convention and we manage it via layer sets. It would be great if we could define (with extensions or no matter how) the non-printing layers.
Miquel
Capella & Garcia Arquitectura
AC18 - AC21, iMac 27" 3.1 Ghz Intel Core i7, 16GB Ram, OSX 10.13.1