It would be super helpful if we could view both miles and kilometers simultaneously for speed and distance. Perhaps there could be an option to select a primary and secondary unit with the primary unit in bold or otherwise highlighted. This would be especially helpful for group rides where users of both imperial and metric systems are trying to coordinate their efforts to form and maintain a bunch.
IIRC you can set the distance/speed in Zwift and on the companion app independently (ie have one of the display metric the other imperial). Pretty sure I remember someone mentioning that on a group ride for just the reason you mentioned.
However, in fairness all cycling should be metric:
Rule 24. // Speeds and distances shall be referred to and measured in kilometers.
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That’s a great idea! 
Thanks