What's the best way to add additional countries to the system with Store 2.x? I see a button in the CP to add a new state option to a country, but no control for adding a new country. Is it possible to do without diving into the database and adding records directly?
Store 1 uses EE's internal list of countries at
system/expressionengine/config/countries.php as Justin mentioned.
Store 2 has its own list of countries at
third_party/store/data/countries.php. When Store is installed, these are copied into the
exp_store_countries database table.
So if you're feeling revolutionary, and you have already installed Store, the best option is to simply update the
exp_store_countries table directly. There is no control panel interface for this, but there's no danger in doing it and your changes won't be overridden with any future upgrades.