Ability to define Resource Mailbox Plans

We do have different mailbox plans for user mailboxes and resource mailboxes.

It would be great to have the possibility to select if a Mailbox Plan is a user mailbox or a resource mailbox.

This way it would be possible to show resource mailbox plans for resource mailboxes and user mailbox plans for users only.

It is a bit confusing to create a resource mailbox and see all other mailbox plans too.

Thanks