User wants to simply click Process Transaction without having to enter payment type and amount every time.
Ie: they only accept cash so they want the system to assume cash payment and go straight to printing the receipt and popping the drawer.
Add that feature ONLY if it can be turned off/on in the management options. We accept multiple payment types and I would not want one of my clerks to change into that feature to make it quicker on them but screw up my records. Thanks