Today I got this item for use at a distance, a Godox wireless remote wich uses the wireshutter release of your camera (K-5/K-7/K20D/K10D, but not on K-r/K-x) to use the camera from a distance. You can also use it to control a flash. With more recievers you can controll more camera's or flashes at once. It should work up to 100 meters, but I still have to see that, and i'm happy with half of that.
First impression: it works!
Reemix Universal 3-in-1 Camera Remote Control for Pentax/Samsung/Canon (1x23A/2xAAA) - Free Shipping - DealExtreme
There are 3 positions: flash and two camera-modes (one for direct release and one for 3 second timer.
I hoped to use it to simultanous opperate both of my camera's with one shutterpress, but that doesn't seem to work.
There is up to x-sync a signal between transmitter and receiver, but there is no signal going to the camera true the wire. It does work for flash, when set to the flash function.
You can also control the moviefunction, since it is then just a on/off button. From a distance you have to count for yourself how many times you press the button, when you can't look on the backscreen wheater it is on or off.
I'll go and try this thing over the coming weeks.