Allow other per-domain API calls for domain sending keys
Allow other domain-based operations such as retrieving events for domain sending keys. It's nice to be able to have sandboxed API keys per domain for sending but it would be more powerful if it also allowed doing things like querying events for that domain, that way you could have one account with development/QA/production domains each with their own keys restricted to those domains.
We have expanded API keys to allow for multiple API keys on account with RBAC restrictions:
https://documentation.mailgun.com/docs/mailgun/user-manual/mg_security/
And now allowed for CRUD to be available via public API:
https://documentation.mailgun.com/docs/mailgun/api-reference/openapi-final/tag/Keys/
No current plan to expand on domain scoped keys beyond sending.