I have to agree this would be far more intuitive button usage. As for menu access, two buttons may or may not work easily. I would really disagree that the unit needs more buttons - more, fiddly, buttons are the reasons for major crashes (the metal sort, not the electronic version)!
I think exactly this button allocation was proposed by one of the correspondents in the install section, although I can't find the thread I'm afraid.
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One of the few remaining Mk1 owners...
#00015