I have defined a role in which I'd like to grant:
1) Permission to edit users
2) Prevent from creating new users
Is this possible? I only see one permission under User called "Administer users" which looks like grants both abilities.
After both modules have been installed and enabled, you will be able to grant user edit but not user add permissions to certain roles within the /admin/people/permissions form.
Nice side-effect: The user editors won't be able to alter the site admin's profile, if you don't allow it, as it could cause serious problems.