Despite the addition of two Reference levels in 8.1 (thanks, guys!) I still think that if you change the ELEVATION of the basic storey, all other stories shoudl follow!
Or - we shoudl be able to choose what to lock: storey distance (the num field on the right) OR storey level relative to project zero.
Angry after a non productive day,
Djordje
ArchiCAD since 4.55 ... 1995
HP Omen