I'm willing to grant access to anyone who has written a script worthy of adding to the file, but not just any anonymous who decides they want to mess with [our] file.
That opens a can of worms -- who decides whether a script is worthy?
I believe that decision belongs to the users, not some middleman. You appear to want Apple's App Store, with its basically arbitrary approval process, and I'm suggesting Android's Market, where any app can be added but the proof is in the pudding and users can read reviews to avoid broken or harmful apps.
FWIW, there has been
zero abuse of the Map Manager, despite its being accessible from a web browser. There's no reason a person couldn't upload a text file of links to malware and porn sites -- or even replace an existing map with bad data -- but no one has done it; and if someone did and it were reported, I'd remove/restore it. Adding a CLI command would be accessible only from within Mafia, and wouldn't allow anyone to mess with another person's submission. There hasn't been abuse of the Script Registry either, which uses this concept. The only risk to users would be if someone registered a malicious script, and in that case the user would be at fault for not checking it out more thoroughly before using it -- most scripts have a place where they are discussed -- and it could be removed by minions at the first complaint so it would have minimum impact.
I do believe the project list ought to include a blacklist section, to prevent re-submission of removed projects.
Basically, we should be looking to minimize middleman involvement, because every step that involves a person's evaluation means delay and inconvenience for scripters, introduces the possibility of human error, and opens the door to personal bias in these evaluations, which opens another door to arguments about the person's decision.