Hey, I havn't been around for a while, but I'm extremly excited about the progress made during this time! It looks like Dwarf Fortress remains the best game ever created, with still infinite potential for improvement!
So, having that out of the way, my suggestion is: (Pardon me, if it's already in and I just don't know
)
Automatic artillery that self-loads and possibly shoots, using the power of a wind or water turbine, which would redefine the meaning of a Gattling siege engine.
The up-side would be increased rate of fire to insane levels and no operator required.
The down-side would be the insane ammount of ammunition required, and close to zero accuracy.
The rate of fire could depend on the amount of power transefered to the engine and quality of over-all parts of the system.
The question is, how would the ammunition be handled, since as it stands, the operator needs to place it inside from his/hers/its inventory into the engine.
It could be either stockpiled inside the siege engine, or the system could require another building that would hold and load the ammunition, requiring more power.
If the latter option would have been chosen, the loading building would have to be placed next to the siege engine, and connected via mechanisms, rendering the siege engine orientation-dependant, if automated reloading was to retain it's functionality. So it could fire only in the direction in which the entire system was built.
Here is another, new idea for a siege-engine feature: Caged creatures, dwarfes or corpses as ammunition.
Just how funny would it be to fire their friends (still alive and dead) at the retreating assailants, making them all vomit cause of the gore?! How funny would it be to role-play insane king who want's to beat the dwarfen record of firing a dwarf from a catapult furthest, without killing him?
The ballistae is far more effective then the catapult, and adding this kind of features to the catapult, which are quite historically accurate I think, would add a lot of FUN to the game! Maybe an insane engine operator could, in his madness wrestle other dwarfes and fire them into a volcane from his catapult?! Imagine the possibilities! Fireing a caged dragon into the sieging army to wreack havock, or possibly get released when fired, exterminating entire fort! So, much, FUN!