I know some love to hate on Flexi but I've always had great support from them. I emailed their support on this yesterday about the cutter registration marks printing in CMYK and if I could set those to be a single spot color (black). Not even 2 hours later on a Saturday, Eyal emails me back with a solution I had totally overlooked which made me feel like an idiot but thats not the point. Easy to set and great support. It's an option on one of the rip and print dialog screens. Flexi also has a ton of vinyl and spot foil color charts built in specifically for running an Edge.