To clear up the tongue in cheek, I probably wouldn't leave a mamiya 6 in the woods all night to fend for itself...lol... but I might leave my Clack there.
It has the same mech shutter release problem, so say I wanted a 4 hour exposure of pitch black night and it didn't get pitch black till midnight, with a timed shutter release it could be set up at a sensible hour to open and close at the correct time during the night, there isn't much on the market that can be programmed this way yet operate a mech only shutter.
There is a thing called any camera shutter release or something, that can be programmed and physically presses the button, but I'm not paying 150 or whatever quid it is for a box of Maplin bits worth a fiver...:/