It's weird trying to describe this: so if you set two camera moves, and you start move 1, and then while move 1 is still moving, be able to hit move 2, and instead of it doing a "cut" to the beginning of move 2, it starts the move from where it's currently at with move 1.
does that make sense? lol
so basically, to be able to program your A-B moves for a camera, and no matter where the virtual camera is during a move, you can hit another move and it will just pick up from where it currently is instead of snapping to the programmed beginning of that next move.
The buttons on the far right of the camera paths panel does exactly this. With the camera path panel selected you can adjust the amount of smoothing for each path and even turn it off completely for straight cuts.