It's certainly all beyond my expertise, but my impression on these overzealous licensing boards is that the titles need to get more specific. If there's no licensing for certain types of engineering, then people doing those jobs should be able to use the title freely. For jobs that do have accreditation standards, the licensed title should be more specific, like structural engineer, or bridge engineer, or whatever makes sense for the jobs involved. Thus, the title engineer alone would still have some flexibility, but the specific engineering fields that need to be protected could be protected. Just my opinion.