BFG multishot

BFG Multishot, also sometimes referred to as BFG Double-tap is a glitch that allows firing multiple BFG-9000 projectiles in a single shot. The alternative name "BFG Double-tap" comes from the fact that for a period of time the way to fire 3 projectiles per shot using this glitch remained unknown.

Requirements and execution
The requirements for this glitch are:
 * A BFG-9000 with sufficient amount of argent cells (2 for 2 projectiles per shot, 3 for 3);
 * Hologram equipped with at least one charge.

To execute this glitch, one needs to follow these steps:
 * 1) Start charging up the weapon;
 * 2) Before the projectile is fired, hold down the equipment key (left ctrl or middle mouse button by default);
 * 3) Continue holding down the equipment key until the shot is fired.

Tactical analysis
Due to the fact that the base damage output of the BFG-9000 is big enough for most situations, this glitch is exclusively useful during boss fights or during encounters with multiple high-health enemies (such as the double baron encounter in the Advanced Research Complex).

This glitch stacks with BFG weapon wheel slowdown; if both are used together, the damage output is enough to kill almost anything in the game in mere seconds.

Unlike the BFG weapon wheel slowdown, this glitch does require a fair bit of practice to execute, as there is of risk of instead simply triggering the hologram if the timing of the key press isn't right. It is suggested for anyone wishing to use this glitch to first practice outside of combat, using a mod to unlock console commands and the command to refill the BFG ammo.

The only downside of this glitch is that it consumes all the BFG ammo in just one shot, and on occasions 3 projectiles may be overkill. The only way to bypass this is to spam the equipment key instead of holding it down - it is less reliable, however, most of the time it will only fire 2 projectiles.