Thanks for the reply!
I looked into the plugin and watched the video that comes along with it. Looks a bit too complicated for me to understand at this point. If there are no easier ways to achieve my goals I guess I will have to mess around with it for a while to try to get it going.
In regards to the other features:
Controlling the speed: I have customized variables that came along with the flying template for Min Speed and Max Speed, I would like to make sure the speed during auto pilot stays between these two speeds until it arrives. This takes away the possibility of using a per-determined travel time.
Animations and sounds: The only sounds that I really need to be able to play are the sounds that come from the submarine while it is moving. They are currently set up to play whenever the current speed is above 0. I have input events that trigger animations inside the submarine that the player must be able to continuously use throughout.
Thanks again.