Recently I got a Pentax ASCOM driver from a Pentax owner who pointed an ASCOM driver that can control a camera using a serial cable. The author has no time to improve it anymore, however he agreed to make it open for the community.
Can you explain this configuration a little? What features do you get with the serial cable? Most Pentax cameras actually have the same remote trigger cable as canon. So you can use the DSUSB products to at least trigger and do interval control.
Yes, Gphoto2 does support Pentax and thats the #1 reason I use StellarMate (linux) for AP.
I think it may be more interesting to port GPhoto2 to windows.