Comment #11 on issue 2527 by [email protected]: Finger-flag collision http://code.google.com/p/lilypond/issues/detail?id=2527
Gould says to place the fingerings above or below the notes, to the left or even to the right. So she wouldn't generally put them where they could collide with the flag. Given that, moving them "too far" away in extremis would seem OK.
