With an M lens, the read e-dial does nothing, as you obviously can't adjust the aperture using it. I believe you can configure it instead adjust EV shift, but I know that's not what you were looking to do.
Since Pentax DSLRs have 'crippled' mounts, they have no way of even telling what the F stop is when a manual lens is mounted. You are therefore confined to the aperture ring
Adam
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