Zerstörer's Screw Cannon.

[Jonan]

There's a mod for quake, called Zerstörer, Testament of the Destroyer, https://www.quaddicted.com/filebase/zer.zip, it has a weapon in it called Screw Cannon.

ScREw CANNON - Fires a plasma charge with an embedded detonator. While the 'attack' button is held down, the projectile will continue flying until it has bounced twice off solid objects.
Any time during its flight, you may release the 'attack' button to detonate the plasma for the maximum blast damage.

It's quite of like a Pipe Launcher and a Rocket Launcher combined in one. You shoot, and then release to explode the "rocket" mid air.

Could be a nice addition, either as a stand alone weapon, or an upgrade for RL or GL.