I have a problem related to this. The thing is that I didn't want students to see each others' entries before I approve them. For that purpose, I set parameters as you suggest (Approved by default = No). Everything was working as expected until one entry was made, I saved some changes (without approving the entry) and the entry was automatically published. Would it be possible for the teacher to make changes and/or comments to entries but the entry remaining hidden until approved?? I'm afraid the answer is 'no'. That's why I thought of a possible solution to this handicap. Maybe it would be useful if the same parameter existing in databases which works like 'x' entries required before seeing the entries already published was also present in glossaries. Just thinking out loud, but could this possibility be taken into account in future versions of Moodle?
Thank you in advance!