Hello @Drinkup,
At this time, there isn't an option to turn on a multi-currency feature in QuickBooks Point of Sale.
But don't worry, I'll pass along your request to our developers so they'll know of your need for a multi-currency feature.
I've got you this article for update about the features of our product: Firm of the Future.
I've also included our QuickBooks Point of Sale Help Articles hub in case you need some references for your How do I tasks.
Keep me posted in the comment section down below if you have any other questions. I'm always around happy to help.