In complex projects, I like to cut 'm in pieces - several Ae Project files that make a project.
Once In a while, I need Compositions from Ae Project B in Ae Project A
In stead of importing it (and losing a link to the original Comps), it would be nice if Project B could be referenced to - imported, but not editable, and updated when Project B is changed, just like a .psd or .ai is imported and can be updated (or an x-ref in Cinema4d).