I wonder
No, VM DEV unfortunately, it does not use standard procedures and features defined in Joomla Framework, but your own (sometimes even 8 years old - look at admin template and sidebar menu).
For example, there in the basket (
www.zelenazeme.cz), we had develop in the shipment plugin Zásilkovna in ollaboration with Rupostel (we paid it, Stan developed) instead of Virtumart's own Dropdown with Search and suggest.
If you need, than you can ask him.