1. Books could be a journal which you carry around. I have a chapter set out just for one book which holds the entire history of the player.
2. Yes, they carry a phone around. It'd be easier to just make the phone call and then come back to where you last were without any hesitation.
3. Yes true, but this way offers way less work.
4. Not quite, does a backpack hold unlimited amount of space? I didn't think so. Think about all the possibilities.
5. Another variation of 1+2 combined would be to carry a PDA with you.
6. Make one chapter set out just for battles. This makes it a lot easier on me if I can have battles in one chapter instead of making one per each chapter. Also, it allows the game to work so that it's do something-battle-get back to doing something without resetting your point.