No can do with the Folder resource. The Folder resource is just an interface for management and display of files in a certain area of the Moodle file system.
If you want a flexible repository try the Database activity module (or the Dataform plugin if you don't mind it's current Beta phase). There you can construct a template for uploading a resource as either a file or a url or just text and then add mixed resources. The Data???? entries may be linked from different places with the 'right-click-copy' technique. The Dataform is far more flexible than the Database and allows you also to display the list in various ways in a block or even embedded in a course section.