I think you might NOT achieve the result you're looking for by using this method, because as far as I remember, the original smoke screen on tanks is actually a weapon, not a "feature".
There are ways to create "fake" weapons on vehicles to make them shoot pretty much any types of weapons we want, but I have never tried it for this. 🤔

I will mess with it a little bit and inform here in case of any good news!

There is a parameter which allow you to define a custom key for any "addAction" you put in your scripts.
Take a look at this last part of the code I have previously posted, but now I have added a "user16" . That will tell the script that whenever the player uses the key configured as the "custom16" (see settings -> controls -> custom), it will execute this action.
You can have several "addActions" with the same key set, so they will trigger simultaneously once the custom control is pressed, but it can also be the same key already set for a mod, for instance, so there might be and easy-to-solve conflict. But you just need to check those control settings prior to set a "user" key, and everything is fine.

  }, nil, -3, false, true, "user16", // here you chose which custom key will trigger your action; "_this == _target turretUnit [-1] && (getPosATL _target) select 2 < 16", 10, false ];
Oh, and I also forgot to mention that you don't exactly need the whole line bellow, as everything after the "&&" is there just because I wanted to avoid the action showing unless vehicle was flying bellow 17 meters height.

So you could NOT use this:
  "_this == _target turretUnit [-1] && (getPosATL _target) select 2 < 16" ...and just replace it for this instead:
  "_this == _target turretUnit [-1]"  

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