I've purchased essential edition and installed it locally. I made changes in most of the settings (countries, states, taxes, etc) in order to fit my needs, especially in localization. Is there any way to use this as "basis" in another installation?
Yes. You can export the hikashop tables via your phpmyadmin. Then, when you install hikashop on a new website, delete the hikashop tables and import your hikashop tables data from your other website via phpmyadmin and it will give you all your previous settings.