"this couple of fields look confusing. If we're able to add multiple addresses, each one should have a country attached. This could be achieved by adding a country select (single) to the wizard lines ?"
In fact, we need to improve the whole attributes system. Because locations are not mandatory for every single projects but can be use frequently as an attribute.
Related to #7
"this couple of fields look confusing. If we're able to add multiple addresses, each one should have a country attached. This could be achieved by adding a country select (single) to the wizard lines ?"