Tellus-DT,
The plugin_customization.ini file has to be in the appropriate Product plugin based on which one is being launched. If you did the All in One installer, then using the c.g.m.product plugin like you have above is right, but if you did your own install of Eclipse + MyEclipse (which I am guessing you did since you are putting this all togehter for internal distribution), it needs to be in the Eclipse product plugin dir, whcih is the SDK plugin dir for Eclipse Classic, usually something like: \plugins\org.eclipse.sdk_3.3.3.r33x_r20080129