i don't know about mutoh's. but the newer roland printers have options in their settings that allow it to run under different ink configurations. cmyk included. my old SC-540 didn't have this option. but like smdgrfx said, the software option provided by flexi allows me to still do cmyk prints in a cmyklclm printer. altho i had to ditch my trusty versaworks for flexi.
Yes. Your RIP software has settings like grayscale, CYMK and CYMKLmLc.
Caution: If you let your Lm or Lc carts run dry etc. the pump may not be able to load ALL the dampers as 3 colors run off one side of the capping station.
PhotoPrint came with my Falcon Outdoor. Works great as CYMK. Check your Signwarehouse? software or which RIP do you use?
I use flexi 10 rip and set it to cmyk simulation and left the lc and lm in the machine. This way it still stays in the machine and runs thru the line, but uses minimal ink.. If you try the ink estimation tool. try running a file with it checked off and run ink estimate then turn it back on and run ink estimation again.. Seemed to work for me.