When you roll the throttle forward for a few seconds and the cruise indicator turns green, that simply means that the EITMS is "armed." It won't actually shut off the rear cylinder until the engine reaches a certain temperature and is at idle. Until those conditions are met, the EITMS is armed but not engaged. At least that is my understanding.
Ah, ok that makes sense. I thought I was able to manually do that. It works fine then. Thanks for the info.