Well, don't give up. Just try and think of a way you can get what you want AND make it useful to everybody else out there at the same time.
I asked for a plugin that would interface with my mood ring and play music based on my mood. I never got it.
I also asked for a Quick Skin menu that would let somebody quickly choose a mini-me skin without having to go into skin manager. I got that.
Basically, the more specific or individual a request, the less likely it is to be implemented. It's simple economics, really. One of the best parts in here is the willingness of the users and the programmers to hash out ideas and find a really good way of accomplishing various tasks.
How about my idea about the field shifting? Would that work for you? And is that something that more people would find useful? And is it something that the guys would be willing to do? If not, let's find another way, that is more useful/doable.
The way I thought of it was that it wouldn't JUST do what you ask. It could also pull URL's out of the Notes field and move them to whatever URL field you chose. Or if somebody had put a sub genre in the comment and you wanted them in one of the Custom fields it could do that to.
So basically in your case it would be:
For all 10 of these files, take the data from "Comment" and put it in "Artist".
Note that that is different from:
For all 10 of these files, take the data from the first file's "Comment", and put into "Artist" of all of the files.
like we can already do (not in one step though).