A global connector profile, or the ability to add a node to more that one connector profile would be nice to have when there is a specific connector (or connectors) that need to be configured for every node in LEM. The only option I see now is to manually add the connectors to each profile in use, or to manually add them to nodes that are not grouped into a connector profile.
A use case could be the FIM (File and Integrity Monitor) connector. If we wanted to use FIM to monitor specific files / directories on every server in LEM it would be easy to configure a global connector with the FIM monitors pre-configured rather than re-create this for each group, or node.