pref_online
Here you can specify filters for the online services requests like cover search. This way you can make better search and get the proper results.
The Language option will be used in order to choose your language for instances in Last.fm panel. In this case if you choose Spanish, all the results will be shown first in Spanish, in case no found in your language, the application will look in English. Also this option is used in the links when you use the {lang} option.
Also you can configure the browser command used when you click in any link.
When you add radio stations there are thousands of radio stations with very low quality. With the 'Radio Minimum Allowed Bitrate' you can filter that radios and are not added. If you specify 0 all radios will be added.