When you mention weaponizing catsplosions... do you mean the explosion itself, exploiting the rapid reproduction for a purposefully destructive effect, or something else entirely?
Because I can think of at least 3 ways to weaponize a catsplosion.
1) minecart shotgun with double wall, and cage stuffed with hundreds of cats. With the new physics system, the adorable kittens become adorable clusterbombs.
2) orbital defense murderhole chutes, suspended 20z above the spiketrap goblin grinder, activated by pressure plates. Each murderhole chamber is a 3x3 room, with the central tile turned into a chute 2z deep, with a hatch on the bottom. Catsplosions in the chambers increase the cat density in the room sufficiently that fighting occurs, creating a fixed probability that cats will dodge and fall down the hole and become lodged in the chute. Catsplosions continue, and the chute's cat density increases radically over time. When goblins arrive, they activate the plate, and cats in the chute are dislodged and become screaming bombs of feline death. The cats still inside the breeder portion of the chute do not fall, and replenish the ammunition over time.
3) same as above, except dropping zombie cats, through placing a walled in necrmancer with view into the plugged chute through a fortification. Cats kill each other fighting inside the chute, ncromancer raises the corpses, zombie cats kill new inductees into the chute from above, necromancer raises those too. Goblin steps on the plate, zombie cats fall. Variations incude auto undead biome in place of a necromancer, or weaponization of evil clouds to drop husk kittens intead of normal zombies, by making the walls of the bottom of the chute into fortifications on all sides.