I can add a few more to your list of SLRs with easy to adjust wheels.
The Minolta XD-11 has an oversize wheel, making it easier to adjust. I believe the X570's is oversize also -- or at least placed for easy one-finger operation.
The Canon EF and AE-1 have oversize wheels, making them easier to adjust.
Canon had to get complicated with the A-1 because they wanted to be able to leave the lens set to A for both shutter priority, where it makes sense, and aperture priority, where it doesn't. They had to come up with that window and sliding display to illustrate whether one was in shutter priority, program, or aperture priority.
Last edited by cooltouch; 03-23-2017 at 11:42 AM.