/sbin/insmod /etc/Wireless/Ralink/rtutil3572sta.ko --> this is working
/usr/sbin/wutil EVENT PLUGIN --> this is not working
Do you mean, you have placed both insmod and wutil commands inside the script ra_insmod.sh, and want to invoke both using this script? If it is, then share that what error you're getting on line /usr/sbin/wutil EVENT PLUGIN
Also did you try to debug this script using a set -xv? Once try it, as it will help you that where your script stuck. To me, it sounds some pb with permissions on wutil, but first you will need to do what's said above.