You two are beginning to confuse me and I'm pretty darn familiar with the workings of the various Bronica cameras.
If you don't want to accidentally take a picture, you have a few options with Bronicas: lock the shutter button, leave the dark slide in, or don't wind onto the next frame (after taking a shot) until you're ready to take the next photo.
Even if you accidentally do take a picture, however, if the lens cap is still on (e.g., tripped the shutter while camera in bag), you could just flip the multi-exposure lever, which will allow you to drop the mirror and cock the shutter when you wind the crank, but the film will not advance to the next frame, so you're still good.
As for cocking the shutter, which is in the lens, I always left the shutters in my lenses cocked 100% of the time and I never had any problems. Whether the shutter is cocked or not has nothing to do with the backs.