I have the SX100 IS and when not in CHDK mode I like the movie mode exposure lock, enabled with the Up arrow. I can enable this even in CHDK mode, but when I half press the shutter key for the AF feature (that's excellent) the exposure lock goes out and the rest of the clip the exposure becomes in continuous adjusting. Does the script have some code for make also a exposure unlock? And, in the case of exposure Lock, is it possible to make some adjust to the exposure when zoom in or zoom out, in order to compensate the lost or gain of luminance when the zoom is applied.