[Pottus]

You need it all command based.

Code:

// Vehicle Object Movement X-Axis
CMD:mvox(playerid, arg[])
{
	new Float:Movement;
	if(isnull(arg)) Movement = 1.0;
	else sscanf(arg, "f", Movement);

	if(EditCar[playerid][cVID] == INVALID_VEHICLE_ID || vehicles[playerid][MVASel[playerid]][object_id] == INVALID_OBJECT_ID) return 1;

	vehicles[playerid][MVASel[playerid]][ox] += Movement;
	AttachObjectToVehicle(vehicles[playerid][MVASel[playerid]][object_id], EditCar[playerid][cVID], vehicles[playerid][MVASel[playerid]][ox], vehicles[playerid][MVASel[playerid]][oy], vehicles[playerid][MVASel[playerid]][oz], vehicles[playerid][MVASel[playerid]][rx], vehicles[playerid][MVASel[playerid]][ry], vehicles[playerid][MVASel[playerid]][rz]);

	return 1;
}

1.) Set movement in enum

2.) AttachObject