Now it should be possible to make your 6-burst code.
By the way:
It has been a long time since I played Daikatana.
But i remember that the futuristic shotgun in Daikatana has exactly the same function:
Push your mouse button once and fire several shots in a row.
That weapon was cool to use and it had a fantastic sound.
Maybe the Daikatana source code is available ?
Then you could just copy it
