When you add radio feeds from Dirble you get taken back to the main 'Browse Your Library' screen. It would make more sense to stay in the Dirble screen so you can add more stations. You can easily exit Dirble when you're ready. The same happens when you manually add a radio station in the MyWebRadios section. It makes more sense to stay in that section. Similarly, when you delete a radio station, it would be better to stay in the MyWebRadios section.
Could there also be some way of listing the radio stations alphabetically? When you have a large number it starts to get awkward to find the ones you want.