I currently run a subscription and set the imageRef for one of my cloud templates based on some logic determined at deployment time. We also maintain the images outside of vRA in a rolling fashion and the image mappings would not work for our use case. Much easier to handle with the extensibility. I'm forced to enter a value though for imageRef or image in the template. Right now I'm using a placeholder empty vm template as the imageRef but that seems lame to have to do. Is there some way to accommodate this similar to setting a control like we can with variables like "awaitIp: false" which I use on systems I'm pxe building or setting imageRef to some value that will avoid a check?