It's widespread here in Ireland. POS terminals have 5%, 10%, 15% and 20% tip options with a tiny and hard to reach dismiss button.

I doubt whoever thinks installing this US software on UK/Irish POS terminals has done their homework. Its simply one way to piss off the customers and embarrass the staff.

Dismiss button? From what I've seen, it's a "Custom" button, where you then have to explicitly type in 0.