Not sure if anyone mentioned the annoying low shutter speed beep... seriously? (Nikon EM/FG/FG-20)
I wish more cameras had a shutter button lock
My F2 has one, but it's not nearly as efficient as the Nikon F3 and later (which just shuts off the power)
I do love the FM2/FE2, "push lever in to lock the shutter button", but then they put in the stupid tap shutter button to activate meter