Sit Down Down Script?

I built a star wars clone LA AT gunship and i want to use a turret script in the two spherical guns on the side. I was wondering if i could make it so when sat in that the user would be able to go into mouselook and fire the lasers while sitting in it. I have a this touch turret script and was wondering how i could modify it to mkae you need to sit down instead of touch it. If anybody knows how i can do this or has a sitting turret script let me know by posting here.


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key toucher;
string toucherS;
float SPEED = 100.0;
integer LIFETIME = 7;
float DELAY = 0.2;
vector vel;
vector pos;
rotation rot;
integer in_use;
integer have_permissions = FALSE;
integer armed = TRUE;
fire()
{

rot = llGetRot();
vel = llRot2Fwd(rot);
pos = llGetPos();
pos = pos + vel;
pos.z += 0.0;
vel = vel * SPEED;
llTriggerSound("shoot", 1.0);
llRezObject("bullet", pos, vel, rot, 1);
}
default
{
state_entry()
{
in_use = FALSE;
}
touch_start(integer total_number)
{
if(in_use == FALSE)
{
toucher = llDetectedKey(0);
llRequestPermissions(toucher, PERMISSION_TAKE_CONTROLS|PERMISSION_TRIGGER_ANIMATION);
llSetText("Requesting Permissions", <1,1,1>, 1);
}
if(in_use == TRUE)
{
if(llDetectedKey(0) == toucher)
{
llReleaseControls();
llSensorRemove();
llSetRot(<-0.00000, -0.00000, 0.70711, 0.70711>;
llSetText("", <1,1,1>, 1);
in_use = FALSE;
}
}
}
sensor(integer sense)
{
rotation k = llDetectedRot(0);
llRotLookAt(k, .1, .1);
}
no_sensor()
{
llReleaseControls();
llSensorRemove();
llSetRot(<-0.00000, -0.00000, 0.70711, 0.70711>;
llSetText("", <1,1,1>, 1);
in_use = FALSE;
}
run_time_permissions(integer perm)
{
if(perm)
{
llSetText("", <1,1,1>, 1);
llTakeControls(CONTROL_ML_LBUTTON, TRUE, FALSE);
llSensorRepeat("", toucher, AGENT, 5, TWO_PI, .1);
llSetText("Current User: "+llKey2Name(toucher), <1,1,1>, 1);
in_use = TRUE;
}
else
{
in_use = FALSE;
llSetText("", <1,3,1>, 1);
}
}
control(key name, integer levels, integer edges)
{
if ((levels & CONTROL_ML_LBUTTON) == CONTROL_ML_LBUTTON)
{
fire();
}
}

}
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Thanks