We are using NCM version 7.4.
I don't have a big pool of nodes to work with now since I cleaned up a lot of these manually to get below the license limit. The ones that I see added via discovery that are still left over seem to be the nodes that didn't have the right SNMP string setup so they were imported as ICMP-only nodes during discovery... and still got imported right into NCM.
So I guess to clarify my original question - Is there any way to disable import of icmp-only discovered nodes into NCM?