One thing to keep in mind is that at some point we'll probably want to put the user-modified settings in HKCU instead of HKLM, so that the HKLM ones can be maintained automatically by wine.inf and friends. That will probably also require winecfg to somehow take into account the HKLM defaults and only record modified settings in HKCU, or something like that. But we can certainly live with everything in HKLM for now.
That should be pretty easy to implement. Right now I'm attacking the drive configuration and I go back to university on a week Saturday so no promises that it'll actually be done, but it should be trivial for somebody else to do with the new code.
