It'd be fantastic to have some sort of chemical warfare thingy going on like I'm running a colony in which I capture as many pawns alive as I can and extract their organs to sell so... it'd be great if I could mortar the ♥♥♥♥ out of an incoming raid with advanced sleeping gas and then go to town with my scalpel >:-)

Another suggestion, please add over-wall gas vents! :D