OK, first off, the game already has a mini-boss (Angel of Death in the Unholy Cathederal
) that gives you a powerful melee weapon that provides an armor bonus... Throwable combat knives have already been discussed by others and dismissed as unworkable (for various reasons) and I'm not really a fan of the dual knives thing, but I do like the idea of a specail multi-square attack for the chainsaw... Indeed, the character from the Doom comic did something like this when he hacked three zombies apart more-or-less at once with the chainsaw...