Hi Ron,
I can only see two possibilities -
1. You may be editing the wrong file. Try to deliberately insert a syntax error and see what happens. If nothing changes, you may be editing the wrong file. Try renaming the file, just to make sure that everything crashes (then rename it back)
2. The variable $killspiders must be set to true to see any difference. This variable is set by the mod itself earlier on, so should be true (unless you've disabled it). I could not tell you why it is not set to true, but you could try to force is by inserting the following line earlier in the file:
Code:
$killspiders = true;
Apart from those tips I really have no idea without looking at and playing with your system directly.