That's not REALLY true. I have a Rome Anthem 158 and I am 6'3. People always tell me the board is way too short, but I don't buy into the height to length ratio. I don't even have my board set to the widest stance and I'm ok. Unless you're crazy tall and riding a kids board, I think you'll be ok. My board has enough of a customizable stance that I'm perfectly comfortable on it.
EDIT: Always remember that there are no rules for riding. If you want to ride pigeon-toed, do it. You may crash a lot and be REALLY sore, but you can ride however you want. No one call tell you your board is wrong or your stance is wrong. It's all personal preference. That's one of the things I LOVE about boarding. Do it your way.