That's very possible. However, if they disabled it because they discovered that it does not work properly (and not because of the software), then this scenario is highly unlikely.If true with the flick of a software switch the could activate it. I know a lot of people want that ability.
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Indeed, there is no "standards" here. As long as the feature does not waste any power when not in use there is only upside in having the feature (there might always be the cases where you don't care about the efficiency).I wonder if the extra battery life that the phones have was intended to be used for this 2 way charging. Maybe they felt it was better to give people the extra 4 hours of battery life instead of the 2 way charge? Just speculation on my part.