Given that anything I add which is both highly controversial and unnecessary will be optional, people can afford to be calm about future additions.
A lot of it comes down to where I devote my energy. Technological innovations sort of fall into a category with projects like tileset support. These options would make some people happy and expand the audience, while taking up some of my time that other people want put somewhere else. As they get further and further away from what we've already got, they are less likely to have time found for them.
For those interested in a specific development timeline for gunpowder, I'll be faced with the question when I make the alchemist's workshop more interesting (assuming that workshop continues to exist). Handling the workshop itself is a middle-priority matter, since the game elements involved aren't crucial but the the building is languishing in a limbo surrounded by mysterious useless raw entries like golden salve and gnomeblight. I may or may not add optional gunpowder around that time. I don't know.
Regarding gunpowder and some basic associated technologies, I can see myself playing either way, really, since I'm not that picky. If I had to choose between having gunpowder on or off in a release distribution init file, it would be off, because Arnold got shot in Commando not Conan, and the Argonauts didn't get shot by handguns or cannons, and Medusa had a bow not a gun, and stuff. We grew up with that crap, and our core DF, our myth/fantasy game, mainly hovers around that sort of fluffy nostalgia, but it doesn't need to impact you more than a one line file change.
Electricity is in about the same category for me as steam locomotives, I guess, as far as whether I'd ever find time to work on something like that for this game. I'd really rather detail the current picture than expand the canvas so much, since there'd likely be a lot of empty space in curious places. Exploring ideas like that might even be more time-efficient in separate projects without hauling the constraints from DF along, though of course some of the mixing with existing DF elements would lead to amusement.
[ November 06, 2007: Message edited by: Toady One ]