I use shotgun with glee but avoid using ltag if possible. Ltags are just dirty. Good players that use ltag just murder everyone lol or it can be used to create an explosion shield, which is only because friendly fire is noobed up.

Though cars can get friendly fire kills lol.

Cars are awesome and ghey:
Fire Mode 1: Melee car for instant kill on max nano suit
Fire Mode 2: Car land mine, only explodes when person gets close, server only processes damage of the car when someone is close. Doesn't differentiate between friend or foe. Ltags turn all cars into landmines.

Car surfing: I stood on the car, friend melees the car, I go flying from one end of the map to the other. The best one was on parking deck, was so awesome, I was on the hood of the car, someone melee'd it forward. The car killed two players, and I got a triple kill whilst crouched and shooting on the flying car. so wish I had xfire going for that but it was a fluke.