Limit user access only to create domains

I've created user in Webmin, limited access only to Virtual Server module and I've set Can edit existing domains? To NO in settings for Virtual Server module.

But when I log into Webmin as user only for creating domains I can delete any previously created domain.

I need to have a user only for domain creation due to security reasons as I am creating domains from within WordPress PHP website and there is user/pass stored - so in case of an attack I won't loose all my domains.

Thank you!