Ogre Cannons: I'll admit to having largely skipped reading D@W battles because I was more interested in Campaigns, but I can see there's some interesting stuff here. There might be stuff in Campaigns too, it's been a while since I've read it, and I want me some Giants with cannons on their backs.
Dungeon Guns: yeah, it seems like taking noise into account would be super important, but I'm a little worried that if it's too punitive people basically won't bother with them. I also have no idea how to make a balanced mechanic to figure how far away they'd be heard.
Eras: so the interesting thing is, Flintlock appears to be superior to Wheellock in almost every way, except that for some reason Flintlock has a higher failure rate than wheellock in wet conditions. At least according to tables, I've already demonstrated I have poor reading comprehension at least once in this thread.
Dwarves: I was just thinking that since dwarves don't do arcane magic it would be interesting if they were the best at casting "gun" instead :-P Essentially I'm imagining a scenario where guns are roughly as available in the era, but with dwarves being known for their gunsmithing and gun use, even though other demihuman races have no qualms about using them. I guess that's about as far as I got.