I don't use auto ISO when I'm shooting on the street Don. I use it when I'm just out shooting scenic or abstract stuff where, all other things being equal, I'd rather err on the side of better IQ and auto-ISO tends to do that well. But for street shooting, I really like to stay on top of all of the variables. I rarely trust auto-ISO to keep the shutter speed high enough except on the GXR where I could set it as high as 1/250. The X100 only went to 1/125. The X-Pro doesn't have an adjustable minimum and I don't believe the RX100 does either. The OMD does but its sort of hidden in the flash settings somewhere. I don't tend to use full manual mode because I care about a very specific aperture but I'm much more flexible about shutter speeds as long as its fast enough. So I just monitor shutter speeds in the light I'm shooting in and adjust ISO as needed, which I rarely have to do very often. I like being able to switch between auto and manual ISO quickly though so if I'm out doing a day of mixed shooting (which I usually do - mix in architectural shots and other stuff with my street stuff) I can switch to auto easily for the non-street and then back to manual ISO for street stuff. This was the key thing that drove me slightly crazy with the X100 - switching between auto and manual ISO required multiple steps in a couple of different menus - it felt like an acto of Congress, which doesn't act. The XPro, OMD, GRD, and RX100 all have all ISO settings on a single menu, as god intended!
You're right about DMF killing the zoom function on the front ring. Not a problem for me but understandably a deal killer for you...
Lots of effective ways to skin a cat...
-Ray