It wasn't mandatory in the previous infinity engine games so I doubt Obsidian would make it mandatory if the feature was added. It would be nice to have the option.
I am severely disappointed that I cannot find an option to lock the screen to my character. I could have swore it was in the original infinity engine games so why isn't the option available in Pillars of Eternity? The option would give the game a great boost and accessibility and usability.
Hopefully Obsidian is paying attention to the forums.