A comprehensive list of conceptual metaphors

No. The only one I'm aware of is the list you mention. The reason is that relatively few people in linguistics actually still use the X IS Y format (mostly you find it in relatively superficial treatments). Most people see metaphor as much more complex and having a single list would simply lead to proliferation of metaphors like "ENVIRONMENTAL CLEANLINESS IS EU NATIONALISM" (made up example). So I think if we brought together a list of metaphor thus identified in the literature, we'd have a rather embarrassing mixture of various agendas. It would be an interesting project for someone, though. I once started compiling a list of metaphors used in education by people who were inspired by Lakoff and Johnson but didn't get very far.