I guess in the good old days of only manual focus, one had to focus on a point and hope the action passed through it. So, being old enough to remember those days, I don't think you are at all mad!
Also, I have been following your thoughts and discusions concerning the GXR M-module with interest. I too would love to have a 'one system' approach to my photography for all the reasons you have suggested. Not sure if my pockets are deep enought for the M-module approach WITHOUT falling back on those lesser mortals which now languish in dusty second-hand camera shop windows. With the ability of good output from high ISO, some of the zoom-glass with f5.6 maximum aperture might become viable...or perhaps not! I would love to have a module for a week, just to play around to establish it's potential. Otherwise I am a little afraid that the M-mount will just have to float around in my dreams for a little while yet!
All the best,