Yes, you are right.
I didn't think of that.
You can set a countdown to prevent creating further bombs within a certain time frame after dropping a bomb.


var bomb_stop;
if(bomb_stop < 0)
{
bomb_stop += time_step;
if(key_ctrl)
{
bomb_stop = -10;//choose your value here
bomb_drop(my.x,my.y,10,nrofbombs);
}
}