Thanks for the comments Coulonnus!
A few responses:
1. Yes. In fact, there is an entire system set up to do that, part of which is documented here: http://imslp.org/wiki/IMSLP:ScoreSearch
(the other part is that I can also modify the search string generator by composer if necessary [as is in the case of Bach], but that is not documented as it would be complicated and I probably should do it myself).
2. Well, it does have search results, just not the results wanted in this particular case. Again, tweaking the search string via #1 is probably the way to go about it.
3. Unfortunately this would probably not save space, since in most cases (as is here) there will be a file-specific Performer's Edition link anyway, which, even if I merged the icons, would itself take up an entire line per entry.