Hello.

1. We've just added the possibility to allow visitors to post comments (https://github.com/unaio/una/issues/4080). It will be released in the next version (UNA 13-B5).

2. Also there is a setting which allows to disable auto approving for comments. It can be found in Studio -> Settings -> Site Settings -> 'Auto approve a comment after creation'. But in this case all comments will get Pending status and should be approved by Moderators/Admins. Unfortunately, there is no way to allow a profile owner to take part in this process.