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Use an input field which triggers the numeric keyboard. Users will be familiar to this as it is a UI that is native to their device. <input type="number"> When using this method don't forget that the chrome desktop browser will display a spinner control. The spinner can be hidden using a bit of css: input::-webkit-outer-spin-button, ...

So long as you are confident you abide by any relevant laws and consumer rights then you can design the PoS how you like, but having designed a UI for large PoS systems, I know it's a real nightmare area for legal requirements. Under some (probably many) laws, the consumer must be able to see clear details of the price being charged for each item, along ...

I think that the action bar is only there for touchscreens, as they don't have hover states. Desktop applications do have hover states. Here, I'd guess the solution would be closer to Fitt's law; an interpretation of Fitt's law could be: put the action close to (and in line with) the object the action is referring to. So, have a column, which has hidden ...