You can do it but you'll have to edit somes files by hand.. And do it for each car I don't recall exactly what files, but it's in the content folder, there's some cam files editable with a text editor
Have a look at this thread for instructions on how to manually edit camera files: http://www.racedepartment.com/threads/new-cameras-dtm-experience-2013.79811/page-3
too much hassle this way but thanks anyway it would be nice to see keybid for move camera left/right in upcoming patch
This option in the game menu would be great. Assetto Corsa has this function and is really a great feature. Devs please!!!