With the way Apple has been going with resource forks, I wouldn't recommend it either, but it does appear to be what Metacorder is doing.
RE: writing a recorder. No, but I don't think I will be doing one for mac either. Take has done a really nice job with Boom Recorder, and at the high end, Metacorder seems pretty nice.
Even if I did, implementing such a program on Windows would require learning a different variant of C and a completely different set of API's (functions provided by the system). Basically the same reason Courtney isn't interested in doing BWF Widget for Mac - you'd basically have to start from scratch.