This is the only way that i know of also. You have to position it in the rip. In my case FlexiI think the control panel for the 1614 is the same as the 1204 and I've never seen any way to set the spot to print with the printer.
The only way I would be able to do that would be to set it up on the Rip to print in x amount of inches.
Congratulations on the new printer though, welcome to the world of Mutoh.