I'm not sure if this belongs more on a GR forum or if it's a service AH could/would/should provide, but the ability to quickly add Esri-based feature services to GR applications would be very helpful and could answer a number of feature requests on the forum. This could allow for more sensitive datasets to be parsed into placefiles and perhaps not shared widely if not desired. Not to mention, would allow users to make custom placefiles. I would consider paying additional for a service that allowed this capability.
Ability to Render Esri Feature Services as Placefiles