This was released today, 7/31. You can go to the permission set for the admins and de-select the option to create a vacancy

Yes! At a large school district this is absolutely needed.

Great request - Peoria schools would really like this option too, as a large district we only want Vacancies added at the district-level.

Thanks so much for this request! Have you considered using the new approval process specifically for vacancies? You could use this to essentially have the building admin put in a request through the system to use a vacancy, but it could be denied or approved. At that point, the search for a sub could begin. Curious for your thoughts there!