No need to rerun Audyssey to switch between height and wide modes.
Can’t select Dolby PLIIx + Audyssey DSX when height speakers are calibrated. However, PLIIx + Audyssey DSX is selectable if no height speakers.
Actually, that's why you need to re-run the calibration. Audyssey DSX can create either height or wide, but only the one which was set up when it was run. (At least that's what I gathered from the review of some Onkyo receiver with Audyssey DSX.)