Tom, have a look at a program called widescreen fixer. It actually fixes the rubbish aspect ratio with black ops, and makes the game totally playable.
In the latest CCC you can set up presets. I have 2 presets 1*5760*1080 & 3*1920*1080. I have these assigned to keyboard shortcuts, so by hitting one key you can change your resolution between "work" mode & "play" mode.