Yes, Falk's blogs are really good for understanding what may be going on behind the curtain with the K-7's video mode. If you don't understand the EV table you might want to look at a brief explanation, such as here:
What are EV and LV © 2005 KenRockwell.com
It would be interesting to get some sort of confirmation from Pentax about how they go about determining shutter speed and ISO. When using the T1i (it lists the aperture, shutter speed and ISO but gives you control over none of them) I noticed it loved to keep the shutter speed around the 1/50 range if possible. If Pentax could confirm whether they used some preferred shutter speed in movie mode it could help us get a more accurate table.
We don't even need control over EVERYTHING, if we could just set the shutter speed, for instance, then ISO could pretty much be adjusted by changing the exposure compensation. Or conversely if the ISO could be locked in we would pretty much be able to control the shutter (especially if the camera would display its settings). When I get some time I may try playing with the video, it made quite a bit of difference on the T1i, for instance, when I jumped straight from macro mode over to video mode and immediately started shooting - that seemed to snap it out of the ridiculous f/29 ISO 1600 settings it liked to pick when left to its own devices. I suspect the K-7 may be a little more methodical in determining its shutter speed/ISO combination but can't prove it (yet)
And yeah, the inclusion of the K-x on cinema5d's site without a forum for the more competent K-7 is puzzling. They could probably lump the two Pentax models together into one forum since many of their aspects will be similar (guess you could throw in the k20d too if you were masochistic enough to try and make movies with it. Hey, at least it had manual controls).
The K-7 would surely get more attention by videographers if it had more controls, its 720p is nice and crisp and filmlike, outperforming the T1i's or Nikon's 720 video modes. Or they could just stick a Canon label on the side of the camera and everyone would be fawning all over it