Ability to control mail storage format only for the default cPanel email account

As a System Administrator for a hosting provider, I would like the ability to set the email storage format to mdbox only for the default (catch-all) cPanel email account as often times users don't check and empty the inbox for that account which can lead to high inode usage, which in turn can lead to extended backup times.

Having the ability to set only the default email account for new cPanel accounts to mdbox upon creation, would greatly help prevent high inode usage from unattended inboxes.