There are some cases where you need to remove a payment from an order. If the POS glitched out and logged double payment, or you accidentally used the "add payment to order" button, then the extra payment needs to be removed to keep the financial stats accurate.
I think ideally this would be a red "x" next to the payment line item, and it should create a popup asking you to confirm the deletion of the payment. Just for extra security, it may be good to ask for a password confirmation too, to help make sure payments don't get deleted by accident.
Yes!