Set default country in Customer Registration
On customer registration pages, the country list is in alphabetical order. Most customers are from our home country but this is near the bottom of a long list. It would be great to be able to set a default country and have that appear at the top of the list (or selected and the dropdown be at that point)
Niels - IT-Solutions (EuroSys) commented
You can already set a default value through the admin of the webshop.
Home > Setup > CustomerRegistration fields > Edit Field and the set a default value (for country in your case)