1. Yes, you can change the position of the camera by editing the configuration file.
4. The Observer mode switches camera positions on its own. I don't think you can control it. But many players have asked to be able to permanently set up side views so I expect this feature will be added eventually.
"Damn the torpedoes! Four bells, Captain Drayton!"
(Likely actual words of Admiral David Farragut, USN, at the battle of Mobile Bay. Four bells was the signal for the engine room to make full steam ahead).