Eh, looks like (on the EU siege server, anyway) if you report someone with QML but they hit M before the timer, it now costs you a multiplier point.
So.. not likely people will keep using it since plenty of genuine leechers aren't necessarily afk, but just hiding out and chatting or whatever. Not worth the risk.
It does permit the griefer game, however, of posing as a leecher - somewhere a bit ahead of your team's spawn, say - to get people to report you, so you can press M and cost them a multiplier.