@TER-OR
Quote: "When you have an A or later series lens mounted you can control aperture with one wheel and shutter speed and ISO with the other. It's a lot more convenient."
I read this very often on this forum, but I am not sure I understand it.
It wouldn't make sense for me to use both wheels at the same time and still have a good grip on the body, so there would always be a switching between using the two wheels.
And I have set my K200D to be used for either aperture or shutter speed, depending on whether the EV button is pressed or not. Because of this usage, Pentax placed the EV button directly near the shutter actuation - shift your finger just some millimeters (a much better design than with some other Pentax DSLRs).
EV settings are not supported in M mode anyway, and the usage of TWO wheels would only be needed in M mode. So there is no conflict
I doubt I could work any faster, or get improved control with two wheels.
EDIT: I remember I tried controlling aperture (with the lens' aperture ring) and the exposure time with the tip buttons of the ME Super at the same time to be faster - I stopped this experiment. Photographing with manual metering is not something to rush. If time is important, one can always use P, Tv, Av...
EDIT 2: I never set the wheel to ISO, just because the difference between ISO100/200 and 400-800 is extremly big (noise). I use only ISO100, because that's where the K200 shines, end equals IQ of bodies with 50% more pixels. In rare cases I may use AutoISO limited to ISO200. If, for some reason, I must use high ISO (no flash, no tripod), I set the camera to Sv. I don't like it, because it means a lot of work in post. But 2 wheels wouldn't help either.