In Mercury Missile InstaGib you have a rocket launcher that shots high-speed rockets with only small (or no) splash damage area and has a configurable zoom feature. The rockets even accelerate after being fired and can penetrate opponents once they reached a certain velocity.
But the best thing is: It's finally available for download. :)
There are two mutators in this package:
Mercury InstaGib - The main mutator for Mercury Missile Arena matches. You can use the Translocator if the server enabled it. Available options are InstaGib, unlimited ammo, splash damage, zoom disabled and a movement prediction indicator.
Mercury Missiles - Replaces only the Rocket Launcher in regular games.
Here are some screenshots for you: