Hehe, I agree that it is much better than to actually use the scroll wheel on the iPod itself
The iDrive interface is probably very different (even though I have not seen it) from the standard radio display interface. We have a "curr" button (I assume it is short for current) that will take you to whereever you are within the artist/album/song hierarchy. Also we have a "up arrow" button that we use to go one step up in the hierarchy, for example from the song to the albums, from the albums to the artists etc. The problem is that after the car has been turned off, the "curr" button disappears, and if you use the "up arrow" it will take you to the top of the list (artists or albums starting with the letter A). Very annoying when my favourite artist at the moment is Danish band Volbeat......