Harking back to the
old goblin suggestions thread.
Suggestion - Via the magic of naturally finding [EVIL] semi-sapients in the world and preset masterwork exclusive LUA semi-sapient pets, goblins basically become a dungeon master archetype, eating and looting the proceeds of spawned in invaders and sieges (or otherwise assigning the bodies to corpse pits/custom butchery halls for subclass of 'corpse meat' or 'gristly meat') from fixed in (Entryway) workshops on the map meant to signify tunnels the enemy comes through as to simulate a siege. (another dungeon keeper trope, and keeps for roleplaying, goblins digging down and being concealed more believable, or even on the surface)
They kill to expand and expand to kill, using hired monster muscle contracted out from traders for gold from trinkets dropped by the entry way traders to expand the monster tavern/trader podium for better classes of monsters. A actual goblin army isn't really that strong but because they are [EVIL] they will bring along their sentient pets with relevant [EVIL] tags in the same behavior we see with trolls. In that respect you could severely nerf them to be mundane with normal life spans but rely heavily on this monster sub-system and their own intense anger to stand up to stronger races like orcs, especially with re-balancing changes like additional movement speed to make them better harrassing chaser, slowing down the enemy while the trundling monsters get in position.
As for my own opinion on skaven, they should be wrife with diseases that only they and a select few other races are immune to, constantly secreted from their skin or by touch encouraging dwarves to wear protection and killing off/crippling un-armoured/lightly armoured foes...