The ability to add a company logo to YouTube emails within the email template area.
Mick Hardy
This can't be done in the current version because it uses the "mailto://" command to kick off a default email client. This is restricted to simple text fields for recipient, subject and body.

There is a feature request in the road map  to move to HTML based emails. This requires a full html editor and built in email client. It's quite a major feature and requires the new version first.