You don't need to exit the game to switch input methods, just to the main menu (in the options, or hit Esc to get the keyboard/controller prompt again). You also do not need to unplug the controller.

The game does nothing to prevent Alt-Tabbing.

Mass Heal is a master level water spell.
Some people feel auto-healing is moronic, dumbs down the game and removes the consequences of doing poorly in a fight, so how well you do becomes irrelevant, as long as you make it through alive.

Not only can you select the spot to resurrect a dead character, but teleporting to another map will move their body.

NPC reactions to theft depend on your reputation and can involve multiple warnings before calling the guards, which can also just result in a warning, or turning hostile.
You can use the shoulder buttons in combat to cycle between targets.

Do you really want the game to show ties with RPS? Would it be more fun if it took twice as long to get through?