There are PBs around here that install pools without auto fill pots....in the desert, with the evaporation rates we have, that is criminal (and stupid). I would think in rainier climates like yours, an overflow wall port and valve would be standard issue.
Well, at least you always get nice fresh rain water to fill your pool. I know it's a pain to constantly have to add chemicals to keep it all balanced, but that's a better option than here where everything just concentrates over time like a pot tea...