Thanks both of you.Iansinclair: Have you actually played this piece? For me at least, switching from 4 to 5 is very difficult when it's quite fast you and also have to play the accompaniment. Right now I just use whatever is comfortable and change the pedal at each quarter note.
and one of the things organists get very adept at, of dire necessity, is switching fingers(or feet! ) on a key; it's the only way to get a decent legato or long hold in many places, since there is no sustain pedal at all. So I'm quite used to it.
This technique is one of the cornerstones of advanced piano playing! Czerny describes it at length in Letters to a Young Lady on the Art of Playing the PianoforteFinger substitution! It's so key.... it's how skilled players seem to never run out of fingers, no matter what incredible sounds are emerging from the piano!
Zimerman purportedly has about 7 different fingerings for every passage in his repertoire which he selects according to the acoustics of the hall he is playing in. I reckon that's some pretty advanced piano playing