Ability to skip the pay now button and only select the tip no other screen interaction needed. Once tip is selected customer just tabs/inserts card. All the other options are good and some merchants would still use but have requests to simplify the interface. included a screen shot of a similar system that does only one touch. Once customer selects tip, switches to a simple insert/pay now with total of bill displayed based on selected tip. I have a few customers wanting a fast and "quickest" way to pay and get the customer through the line.