I cant imagine any MP server running a mission with this on. If the default setting is off then there is little risk of it being accidentally left on. I think it would be a valuable training tool to have this option available.
And how is hovering going to be an advantage? They are a sitting duck when hovering.
Let people choose how they want to fly instead of you dictating to them how to enjoy the sim
Also, the server and mission options override the client options.