As much as I like the Nikkormat and Olympus, I struggle with the shutter control near the lens mount.
The problem is that I need wider more distinct tactile properties between aperture, focus, and shutter speed rings. So for most lenses where you have a wide focus ring out towards the objective lens and a narrower more distinct aperture ring near the mount, that works for me.
I'll admit not being that fond of the Leica M lens' arrangement either. One other disappointment was my 28-85 Nikkor zoom, where the zoom control is a ring - I was always zooming instead of adjusting aperture. My 35-135 is a nice push/pull.
I suppose if the OM were my only camera, I'd get used to it.
A quote from the Nikon website:
"
The Nikon FM adopted a square-type focal plane shutter called "Copal CCS-M". This shutter unit features in that shutter speed selector cam shaft is arranged horizontally, and if coupled directly with the shutter dial, the dial goes through the camera's front panel.
This was same as in the previous "Copal Square S" shutter unit and other manufacturers actually located the shutter dial in front of the camera body.
The Nikomat series, starting with the Nikomat FT (See Part 5.), brought the dial to the lens mount area for the sake of looks, but there were arguments for and against this.
When adjusting exposure by looking through the viewfinder, the aperture ring and shutter dial are close to each other, for easy operation.
Once you get used to it, you can find out the shutter speed setting from the position of this dial's lever.
However, on the other hand, some criticized its relatively unsophisticated lens-shutter-camera-type looks.
Many people had an idée fixe that a shutter dial of a focal plane shutter should be located on top of the camera.
As a result, the FM's shutter dial was placed at the conventional position, as on the Nikomat EL, ELW, and Nikon EL2.
This arrangement requires rotating movement from the camera top's dial to the shutter unit's front cam shaft, and bending 90 degrees of the rotating direction.
The designers considered using gears, but too many gears would be needed, and the plays will not be completely eliminated. One day, an engineer suggested using a durable string. Despite skepticism, it worked just fine, without shifting or loosening, even after hard testing.
Thus, we succeded to position the shutter dial conventionally in a very simple way using a string a pulley."
http://imaging.nikon.com/history/chronicle/cousins09-e/index.htm