Auto detection of "Allow Scripts network access"

You can try this.

function isSecurityPrefSet(){ // check if the setting allowing script to overwrite is active.
    try{
        var securitySetting = app.preferences.getPrefAsLong("Main Pref Section","Pref_SCRIPTING_FILE_NETWORK_SECURITY");
        return (securitySetting ==1);
    }catch(e){
        alert("Error in isSecurityPrefSet function\n" + e.toString());
    }
}

Call it by using this.

if(!(isSecurityPrefSet())){ //check if the setting allowing script to overwrite is active.
    alert("This script needs access to write files.\n"+"Go to \"General\" OR \"Scripting & Expression\" panel in App preferences to make sure\n"+"'Allow Scripts to Write Files and Access Network' is checked");
    app.executeCommand(2359);
}else{
    //do this
}