I think they've been covering it since the beginning, but it's only shown up in concerts and on live albums, never studio albums. But it would probably lose some of the intensity if they tried to record a studio version, so I'm glad they haven't.

I drifted away from DMB, too, after Busted Stuff was released (didn't care for the direction they were going), but I drifted back for GrooGrux!