It would be really useful if you could transfer a Web AppBuilder (Developer Edition) application from one organization to another. Currently if you create an application in one ArcGIS Online or Portal organization then export it to a zip file, you can't import this with Web AppBuilder into another organization.
This feature would enable the easy sharing of widgets that have been configured or customised. At the moment the only way to do this, as far as I'm aware, is to create a new web application in WAB in the second organization then copy the widgets from the first organization piecemeal into its folders.