Adywan couldn't of messed with such a famous opening scene like that. I think the cue is perfect the way it is and is one of a couple things in these movies that can't be changed no matter how good the idea. Adding music wouldn't be necessary considering how well known that scene is.
Totally agree on this one. Putting the march in ANH will detract from it's use in ESB, when Vader becomes a lot more menacing as his motives come to the fore.
DE