Hi, we are currently working on several Selectors to be release as part of the Service Pack in June. Media selector is our top priority in this area and we look into enabling the user to select an image from a Media library (from an Inline editor of a Widget as well as from Widget's properties dialog) and also upload an image that is saved to a Media library.
We further plan additional selectors such as Path or Category selector and also general support for opening dialogs so that you can create additional custom selectors.
David Komarek
Product Owner