It's possible to use several countries for one currency, your customers from many countries will see prices for your products in one currency such as: your store is selling online in German, all of them from German can see price of your products in EUR, even your customers from France, Austria, and Italy they can see price in EUR as well. Especially, you can totally set up the plugin to switch the current currency according to a selected language and it allows your customers to choose a suitable language to country with currency. For example, if you have a rule for English with GB pounds the plugin sets the currency to GBP if a visitor selects English (UK).
One more great for this plug in, you easily create multiple rules for currency and language so that your customers conveniently see prices in their currency and read information in their languages such as : Rule 1: currency - EUR, Language - English, Countries - EU(Select as many as you need). Rule 2: Currency - GBP, Language - English, Country - UK, and more...Moreover, you are able to set default currency for your store, and your entire customer will see prices for products in EUR.