I agree. It would be excellent to see the "Korg open archetecture VA for windows XP", or whatnot. It's kind of the problem I found in the Korg Oasys when I played around with it. The salesperson called it a "limited open archetecture synth." I thought that was funny.
When will dedicated desktop computer synths(such as reason) get on the open archetecture boat. Even the synth modules in it are crippled and I find myself running into brick walls when I want to patch something cool together. Of course, korg never built a modular, so it might be a hard sell.
But I'm VERY afraid of non-desktop computer VA synths, such as the nords and waldorfs, because once they break, they cannot be fixed. I mean, you crack the thing open and all there are are a handful of custom LSI's and lots of surface mounted chips that are wavesoldered on by machines. So if it breaks, throw it away, I guess?