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2) go to the expense of more than one button....my computer mouse has multiple buttons, TV remote -far more than one button, neither forces me to use a menu to do simple functions.
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That would be the key thing for me too. VW I can do without - I think it's an advantage, but not a 'deal-breaker'.
Single button interfaces just seem like far too much work though.
I actually think you could pull off a good two button interface. If you had one button for 'fire', and another one for 'menu', which you could click through multiple different settings with, and then use either button to increment or decrement the setting, and wait for a few seconds to drop back to 'fire mode', I could see it working.