I would be happy if Jerry had no emotions whatsoever. Because the thing of it is once you go down that road... here's Jerry, an emotional being cooped up for 300 years with no one to talk to... none of the socialization, the emotional growth that comes from contact with other emotional beings...
What happens if Jerry gets mad?
Are you telling me that by Harry going into the Sphere, he now has the power to manifest his dreams, his fantasies.
MANIFEST! MANIFEST! He made it happen. It's not that different from a child. A child imagines something that believes its real and its not there, but with Harry, He not only makes it real from himself, he makes real for all of us.