True Backbutton focus

I would like to see that the shutter button is totally decoupled from focus.

Right now you can set manual focus and focus with AF-L. I would like to extend this to the continuous focus switch setting so in this mode AF-L triggers autofocus but also respects the point/wide/zone setting.

The focus switch "S" setting would behave like the "M" setting does.

I think this could be done with a pure firmware update.

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