Am afraid, additional code modifications are required to do it. They are not complex. Check fn_init_currecy and fn_init_language functions in the app/functions/fn.init.php
It switches between different currencies automatically due to the visitor's IP. Eg. A dollar is a default currency on your website, euro is the currency for the visitors from Europe, a pound is the currency for the Great Britain's IPs. So, the visitors from Europe see prices in euro, the visitors from the Great Britain – prices in pounds and all the others see prices in dollars.
We are happy to answer all your questions about this add--on.