I think there should be stat for few things with utility.
Flash - how many enemies you flashed and how much flash assists you have
Grenade - damage and kills
Now comes the hard part
smokes and molotovs. You cant really measure how good they are because if smoke has a gap its just terrible etc. And for molotovs you cannot just measure dmg, molotovs are insane when it comes to cutting people of without single tick of dmg and so on... Its hard to quantify.