Right after I got my FM2N, I thought the meter was broken when I inadvertently set the shutter speed to B, which shut the meter off. With my F2S, the B setting is also the 2-second setting.
With the F3, why is that it locks any manual shutter speed above 1/80 before frame 1, but you can still go all the way down to 8 seconds? It seems more consistent with the idiot-proof design to lock shutter speeds slower than 1/80.
While we're at it, why not make the camera lock in at 1/80 in A mode, but change M mode to allow access to the full range of shutter speeds (and the damned meter)?