have you considered rendering everything in 60fps but *actually* only animating in 24fps, so that your panning and scrolling can be 60fps smooth while still leaving enough to the imagination
still would have to be extremely extremely meticulous with all the camera motions and keyframes, which is ok, but the other problem with that is: 24 doesn't divide into 60. so you would have a skipping effect. 20 might be nice. However, there is another problem relating to youtube, which is that currently i don't think you can post videos at 60fps without eliminating the option for 30fps at 1080p. so if the viewer's computer can't handle 60fps, they would get bumped all the way down to 480p resolution