Considering multi-dmns, only want users 2 have ability to setup subdomains on thier initial domain

Hello support,

I hope you're doing well today!

I'm considering multi-domains but I only want users 2 have the ability to setup their sub-domains on the domain they initially join. I don't want them to have choices of other domains. I know I can setup domains as private but then visitors will not be able to setup a sub-domain at all. Is there a way to set this plugin up so users cannot see the list of all of the public domains? It seems to me that hosts should be able to select 1) private 2) shared or 3) site specific

Please tell me there's a way to do this.