why custom tabs?

lets give you an example, my favorite internet radio, http://www.frequence3.fr has two features I liked very much, vote and display cover from current song.
What I like is customize one tab to display the art cover and put a couple of buttons to vote the song. Each custom tab could be binded to a script file to generate the tab content.

I think its a good idea......

cya!!

PS: Sorry with my fu***** english