I'm not sure that using a setuid bash script is going to work, often Linux won't let you elevate privileges for scripts.

I tried applying one of the mods in version 9.3.3 (tweak Y) and it didn't work completely. I applied it manually as root and all went fine. That's why I suspect a problem with the script being setuid root.

I also think that in this case (custom mods, tweaks, etc) it would be better and far safer to require the user to give the root password. I mean, just imagine the havoc and damage this script could cause in the wrong hands.