This should go into the Feature Request forums, sry
Since there are some problems with the last.fm synchronization (it doesn't find all the artists, although they are available on last.fm (e.g. Adele, Alexandra Stan..)) it would be nice if you can manually add the URL for the specific artist, if you click on "Artist" (where it now says " No Data exist or the Server should be re-synchronized with Last.FM Update Function. "). Given the correct URL the server can crawl itself through the last.fm-Page.