I'd like a flash like the
Metz Mecablitz 28 CS-2, but with wireless P-TTL slave support. And, it'd be priced under $100 US.
If, in order to hit the price target, the current intelligent non-P-TTL slave mode had to be removed, fine. And likewise the wide angle and telephoto attachments could be sold separately.
Bundling the AF200FG with the K2000 doesn't really add much — sure, it's more power, but without even a tiltable reflector, it doesn't add versatility.
However, Pentax has done something really cool: the built-in flash on even this entry-level model can control a wireless P-TTL slave. Pentax ought to play that up and instead bundle a flash designed to be used off-camera.
The suggestion above would make me really happy, but alternately, of course, simply replacing the AF200FG with a model with wireless slave support would do the trick. This would move the flash from being something that gets discarded if the user ever decides they need more to being the "gateway drug" to a whole wireless flash setup. And since none of the competition offers anything like this on comparably-priced camera bodies, it'd be an excellent sales gimmick.