I do have a testroll that I use for instances like this, and the multiexposure-mode lets me cock the shutter as much as I wish. I'll see when I get home from work if its possible to advance frames by using the knob on the film back. If it is I'm home free. Would be nice to operate the SQ-am completely manually in low temps since this camera has a few nice features that I would not miss out on. The square format is one thing that I would like to be able to use under any condition.