This doesn't stop people from making r3 music box extensions. It'd only give them a very small incentive not to do it. Anyone lazy enough will still extend the mp3. What needs to happens is extensions repeating the same song need to be banned. Extensions are the problem. Lazy mappers are the problem. Sure this proposal might encourage 1 or 2 people not to extend their mp3, but other lazy people still will. If a song is 4:30, its 4:30. It shouldn't become 5:00 just because you're too lazy. Another problem is the BNs willing to rank it.