In UNA CMS, permission levels are defined for different user categories. By default, 'Anonymous' users have very limited permissions, usually restricted to viewing content. My question is if 'Anonymous' isn’t currently available as an option when setting permissions for a custom form, can we manually add it in the database, for example in the table, and then associate it with the necessary permissions so that it can be used when defining form access or write permissions? Or would this require additional modifications in PHP or the permission management system?

The use case I’m trying to cover is allowing anonymous visitors to post simple classified ads for example, selling a product, offering a service, looking for a specialist, or advertising a property without forcing them to create an account. The form should allow them to write a title, description, and leave a phone number for contact. Ideally, this should be handled through a custom form in UNA with appropriate permissions set for the 'Anonymous' level.

So, is it possible to safely extend permissions for 'Anonymous' users in this way, and if so, what would be the recommended approach: database-level changes, adjustments through the UNA Studio ACL interface, or custom PHP implementation?