It looks like the code that deals with checking the plist and setting the `mediaPlaybackRequiresUserAction` value is incorrect.
it makes the assumption that this value is set to "NO" by default (which is incorrect); and as such does not allow a user to set this value to "NO".
Relevant code: PhoneGapDelegate.m, lines 425-427:
if ([mediaPlaybackRequiresUserAction boolValue] && [self.webView respondsToSelector:@selector(mediaPlaybackRequiresUserAction)])
(Apologies for not submitting a patch myself, I'm still battling #104)