Wait... If not changing course/maneuvering, what is "commanding" a cv?
Also, preventing others from launching is pretty much a terrible idea.
Wiley.
When taking command of a group no one else can make changes unless you have a higher rank to steal command away from the player that has it.
If no one is in "command" of a group any one can change the groups heading be it via "looped" or "way point".
As for the "preventing players from launching...." its only for that 15 minute window where the group is closing from 25 miles to 10 miles to maintain that element of surprise for a sneak attack.