Well, I'm useless at coding, but I'm good with ideas for monsters, syndromes and stuff like that.
For example, take your common DF vampire. Plague of legendary dwarves, is he not? But don't you think he feels a bit lonely? No other types of monsters to socialize with, or to fight over victims - I mean, you'd get bored fighting your brothers and sisters all the time,wouldn't you? You'd like some variety. So, why not add more sneaky night creatures? Take, for example, the Malaysian "vampire" (the name's a placeholder while I try to remember what they're called). These monsters take the appearance of a woman with long black hair. But the hair hides something. You see, on the back of their neck, they have a long, flexible proboscis - think like an elephant's trunk with a plunger shape instead of nostrils. The come for babies and small children in the night, and use that proboscis to drain all the blood out of the child, leaving a sucker mark. Such a creature could come into your fort and fight with regular vampires over territory or people - say, a boy on the edge of manhood. The vampire has claimed him for the future, when he's old enough, but the "vampire" wants him now.
If you take the concept of torturing/brainwashing your opponents until they join you, a la Dungeon Keeper, you have the potential to create a menagerie of madness to unleash upon any who dare come to your fortress! Say you capture a will-o-the-wisp, and eventually it agrees to do something for you, anything - if only you let it go. Now, I know what you're thinking - it's pretty weak sounding, right? Not when a sieging force follows it off the beaten track, only to be confronted with a dozen armoured griffins, who proceed to tear them to shreds and devour their entrails.
What about a syndrome that merely appears to cause horrible boils and blisters all over a dwarf, but is actually on a time delay before the real syndrome comes to a head - the infected dwarf's blood will become acidic, their boils and blisters will bleed profusely, and they'll gain a strength boost. Said "dwarf" will rampage, having become undead, unfeeling, and opposed to life. They'll also be infectious.
So, am I hired?