"I always run into problems when animating a camera over a path etc and rotating it etc. So I have made a plugin that combines a number of functions in one.
You can access the percentage on a path - the roll angle - left/right rotation up and down rotation. It also controls the fov. It's also handy for adjusting the curves in trackview cause all the tracks are below eachother - so you don't have to switch ten times to get the correct curve... "