I don't know who is in charge of keeping standards and such, but the QR code for BTC addresses, which can include the amount to be paid, should also include a section for suggested fee. This should then also be added to the BTC android clients and POS systems. Currently, when someone pays for stuff at a POS location, they can scan the code to get an address and the amount, but can select the fee themselves, and if it's 0BTC, it may take a very long time for the transaction to clear. If the QR code includes a fee, using a compatible phone app, on scan, the price could be something like 1.995BTC with 0.005BTC fee, for a total of 2BTC, and the seller can be more sure that the transaction will go through. This isn't mandatory, or course, but would help to make the system much simper for end users, and will give sellers more control over how quickly they want their transactions to clear.
This is also nice from a marketing point of view, because people see how low the transaction fees are. No need to show them the "other hidden PoS fees"