The retriggering of notes held isn't proving useful to me.
It's not just the octave shift, but on program changes. It retriggers all notes held simultaneously at full velocity. I can work around it by "remembering" to lift my fingers prior to changing programs. I'd love the option to turn that undocumented feature off.
Yes, I confirm this behavior on my SK1. To me, retriggering the note(s) seems like the most reasonable thing to do, since I'm holding the key(s) down. Not retriggering would leave you in a weird state where the held notes are still in the original octave, and the non-held notes are transposed. I suppose that could be useful in certain circumstances, but I can't think of one.