This is a bit of a two-parter.
1) I'd like to replace the address field with a dropdown of provinces - is this possible using hooks?
2) Is it possible to add your own predefined lists to the dropdown using hooks? Right now you have items like Continents, Gender, and Age. I'd like one that is more site-specific (list of vehicle models) so the client doesn't have to paste in the items on their own.