Ask Camera+ -- they had this as a hidden feature, and then got their app pulled from the app store because of it (more because it was hidden). When they were allowed back in, they were forced to remove the feature from their app before Apple would allow it.
Because it is necessary to be overly dramatic. There is no reason to delete Camera+ just because of that. Sure, it'd be nice to always use it but if you're dead set on using it then unlock your silly phone and use it. (as I do)I don't understand. Why do you have to delete camera+ from your phone because you can't access it in this way?
No you can't. You cannot change the default lock screen camera app when using the phone as stock.There are an option in camera settings where you can change your default camera app for lock screen if you can't change remove your app from your mobile and than set default now re install app so you will get your chosen settings.
Yes. Here is an app that uses volume buttons to take pictures: