Its nice to have smokelauncher on the speedboat... when you can use it ! :)
If the driver is alone on the speedboat he can press the G key and so launch smoke grenade. But if a plyer get in commander or gunner seat no one can use it anymore.
Would be nice if the driver or the commander can always use the smokelauncher. (usefull for dropping soldier and cover them with a big and nice smoke screen.)