I'd like the functionality for standard users to be able to edit any contact source setting (e.g. change the VMTA name, attach a seed list).

This used to exist, but support claims it was never available for standard users, only for org admins.

We share our org with several business units within our company, and they each have their own VMTA/IP that they send from. Most of the other business unit users are standard users, and to ensure their emails are sent from their designated VMTA/IP, I want them to be able to edit contact source settings. OR be able to set a default VMTA/IP per user.