Out of curiosity, are there any plans to extend the functionality of the FramerPS.jsx script to allow for exporting from other Adobe programs, like Fireworks?
Not that I know of. There's a plugin for Sketch, which will most probably be merged into the next major Framer release, but no Adobe. I know Fireworks is doable, but I haven't found the time to work on it. Also, from the little I know about Illustrator scripting, it also seems capable of running a Framer-like operation : )
Yeah I guess it could be done technically but there are no plans because Photoshop and Sketch seem to be the majority players.