Actually, the LazyMatrix has its own set of weapons, which allows the Insant Hit Weapons (such as Enforcer, Shock Rifle, Sniper) to fire projectiles instead. So, if you want to play like an Enforcer Arena, you should get the Arena Match (created by Wormbo), and use both mutators (Arena Match and LazyMatrix). That might work.
For the person that doesn't see trails... probably it's something related to your computer, I don't know. Try changing the rendering device, or your video card (hehehe)... Or... open your eyes