The idea in itself sounds useful, being able to navigate through code, but not for the reason you gave. Also, why stop at comments/labels? Why not make it figure out which variable is defined where, and take you there when you click on the variable itself? Then you just need to write the comment next to the place the variable is first created. The same would be useful for subroutines as well. (In fact the VB IDE does something like this, though it doesnt jump back to where you came from, I wish it would.)
And while you're at it, and storing subroutine names/definitions etc, you could make it automagically fill in subroutine parameter skeletons.. Oh, wait, VB does that too :)
As the rest have said though, this is like closing the barn door after the horse has bolted. Don't attempt to fix your bad programming with a better way to keep track of it, fix the programming instead. If you have three arrays that need to be changed simultaneously (though that sounds as if it should be one structure, then), make a subroutine that does just that, and call it instead.
Lastly, no, I wouldnt want a spider that ignores robots.txt, its there for a purpose.
C.
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