Could there be a choice for the default color for all the Crop Marks in Preferences? It is black right now and there are temporary choices possible with the border coloring system but in my experience that can be quite risky. A grey, yellow or similar less visible mark could halve the cuts to be made with many prints on one print page. Blue light near the cutter makes the yellow marks dark enough.

Met vriendelijke groet, Ernst

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
November 2016 update, 700+ inkjet media white spectral plots