This extension offers you the control system of the country index by the admin.

You can decide, if the land, payment and/or shipping control is enabled and disabled. You can find it below rank, paid and shipping (which point is shining:red=disabled green=enabled).

That means, that you can assign which countries are available and if the dispatch and the payment are allowed to this place.

Additionally the selection difficulties with the federal state (if you have choosen a country) is removed during the registration process. If only one country is available, the country drop down list is displaced by a simple text, while the requirement asterisk is removed.