Feature Request: prompt upon unrecognized / multiple barcode

[test_pilot]

Hello, we have a very busy physical store and sometimes not all product barcodes have been encoded correctly. While POS does indicate unrecognized barcodes, the popup disappears quickly and sometimes goes unnoticed by cashier. A better option might be to make play a sound and initiate a prompt for user input (like press OK button to continue). This would reduced the number of unscanned items going out the door unnoticed!