From the phone app, have an option to start the seat heaters (at the very least for the driver) and rear window defroster, front defrost, and possibly even the heated wipers if winter package is installed.
Could be made as simple as a check box that enables/disables these functions when the heating is remotely started.
Steering heat would be a bonus.
Should probably not require more than some changes in software and the app to be made possible,
Remote seat heaters now available in the app. Car requires 2018.48.12.1 or later. When climate control remote activated, seats will automatically set on if already set on (takes a few seconds to shown on the app). You can then toggle them on the display.
(lightly edited by moderator)