In this article I will show you how you can make your Custom EditView of any module also work for quickcreate via subpanels.
This took me way too long to figure out as well and I am happy to share the quite easy answer with you!
In your custom view.edit.php file add the following line inside the __construct() method:
$this->useForSubpanel = true;
The above code will make custom edit view functions to also work for quickcreate.