5-color output from Ricoh 7110?

Has anyone here had any experience working with 5th colors on a Ricoh Pro C7110X. The process calls for a custom spot color on a discrete layer. But, when I follow that, the output from CDR X6 (and CDR12) prints the spot color as converted to process color. All the features seem to be present, but they don't provide the desired results. Any guidance?