Goblins just not enough Fun for you? Are your dorfs curbstomping goblins on a regular basis? Adventurers tired of easy camps, unless the enemy gets lucky (evil spearmen and their right foot attacks)?
Based on the Orks from Warhammer 40K (vaguely anyway), these Orks are still somewhat of a work-in-progress as they have no special hierarchy and could probably use more special weapons, but they are quite powerful.
Now attack all year round.
Now have shiny metal for their choppas.
Please note that I am using the Phoebus graphics pack for my general game, but not for the orks.
Note that as a side effect of smelting editations, several of the metals will be classified as economic rocks in fortress mode stockpile lists due to the tag that causes the hard-coded reactions to also determine classification.
From the Creature Anathema rulebook: The Orks are a barbaric and warlike race that infest large portions of the galaxy. In unknown corners of space Ork empires rise and fall, wagin war against races unheard of by the Imperium. The Orks are so violent and numerous that, were they ever to combine, they could sweep away the defences of all the other races, painting the galaxy green. Fortunately, their propensity for violence is their undoing, for Orks like to fight amongst themselves as much as against other races, their would-be empires normally devolving into petty squabbling and infighting before they can threaten the denizens of the galaxy. Ork Physiology: An Ork's body contains the gentic traits of both animal and fungal lifeforms. This plant-like nature is responsible for the Ork's icredible physique and toughness. ... This algae is the reason for the Ork's greenish coloration and freakish durability. Ork reproduction occurs by dispersing spores that settle and mature over time. When an Ork dies, this triggers a mass release of spores that can develop into dozens of subterranean cocoons.
More research has been performed! It would appear that the Orcs of the Warhammer universe are the same species as the 40K version, just less technology and more brutish.
Choppa

Without further ado, the code.
Put into a simple text file that contains the code and short directions and what to do with it.
http://dffd.wimbli.com/file.php?id=3641 As I suffer from chronic laziness as a character flaw, I will be putting the one update in code spoiler.
Add to Ork entity:
[WEAPON:ITEM_WEAPON_SHOOTA]
[AMMO:ITEM_AMMO_BOLTS]
in the place of the crossbow entry.
Insert into the items_weapons file:
[ITEM_WEAPON:ITEM_WEAPON_SHOOTA]
[NAME:shoota:shoota]
[SIZE:200]
[SKILL:AXE]
[RANGED:CROSSBOW:BOLT]
[SHOOT_FORCE:8000]
[SHOOT_MAXVEL:100000]
[TWO_HANDED:0]
[MINIMUM_SIZE:15000]
[MATERIAL_SIZE:5]
[ATTACK:BLUNT:20000:8000:bash:bashes:NO_SUB:2500]
Enjoy!
Credits:
Ivan Issaccs: First announced tester!
Sutremaine: Metals as reactions.
Rysith: Aid with the headless.
Aarik: Aid with the headless.
3: Aid with the headless.