Probably not what you are looking for, but are you aware of the various e-books for specific cameras available here on the forum? They were written by former member (now passed away) Yvon Bourque, and expand on the info in the owner's manuals. You can't hold a PDF document in your hand (unless you print it), but they do have useful tips. I bought one for my K-5IIs and KP. If you are interested, go to the donations page and scroll down.
PentaxForums.com Pentax eBooks
I also have a printed K10D book published by Magic Lantern. It seems like you are looking for a comprehensive book covering several models though. Maybe others have suggestions.