Mode noun – A distinctive way of putting ideas into words. Custom is a synonym for mode in way topic. You can use "Custom" instead a noun "Mode", if it concerns topics such as manner, craze, style, method. Nearby Words: modal, modeless
It's a very useful ability, as it can save your butt if you run into too many enemies at once, are about to get hit by the game's different BFGs, or, as players figured out in Forge mode/Custom games, set the speed higher than normal and fly across Forge World in your glitching glory!