I currently work for a company that does iPad based SASS POS, and I'd like to think our app is a lot better than the old POS systems out there.
One of the problems you always have to deal with though, is that no matter how good the app is, the person programming in the menu can still be completely useless and make it annoying to use, so the challenge is to make programming in the menu as easy as possible.
Being iPad based means that we can actually utilise touch-screen actions, e.g. you can swipe items into a tab, rather than having to tap the item, and then tap again and tap some more, like you're describing.
One of the problems you always have to deal with though, is that no matter how good the app is, the person programming in the menu can still be completely useless and make it annoying to use, so the challenge is to make programming in the menu as easy as possible.
Being iPad based means that we can actually utilise touch-screen actions, e.g. you can swipe items into a tab, rather than having to tap the item, and then tap again and tap some more, like you're describing.