I'm not sure about this, but can you not a-click in a certain direction to move the turret in that direction?
In theory. I practice it's unworkable to try to hunt down a couple of Katyushas (for example) with a Panther and when you get there deep in enemy territory you have to be quick and use element of surprise to succeed you can't move and manual attack all the time just because you pass by infantry on the way. Also it doesn't help that the tank actually fires at stuff on the way and risks arriving at the scene with critical few seconds of clean shot and the first thing you have to do is reload... and probably also alerted the enemy just before by shooting at meaningless stuff, minimizing the chance of successful raid and escape. What you can hope for then is successul suicide mission (plan B). I swear I have arrived more than once to kill Katyushas and the Panther just stood there looking while reloading and they backed off. And then everyone dove on me from all directions alterted by the shooting in the FOW just before.
How hard can it be to implement a hold fire button for all vehicles.