Ability to customize generic email invite for new, SSO users (and remove the note to create a password, etc.)

The customization options for the Invitation Emails need to be more customizable. For example, I would like to have our logo included, maybe our branding (colors, fonts at a minimum) and because we are SSO enabled, the message about creating a password, etc. is not applicable and confusing. I would love to be able to customize this email altogether and not have my name specifically mentioned in the email if I do add a custom message. I would like to include links to our process manuals as well.