Late to the party on this one, but here's how I was able to set the 'nobody' role for a list_edit ACL that I had:
Step 1: Create the ACL you want and add some role, doesn't matter what.
Step 2: Type in 'sys_security_acl_role.list' into your main filter navigator and hit Enter
Step 3: Find the ACL role record you created in step 1, you can filter as shown here. Once you see the record, right-click on it and "Copy sys_id":
Step 4: Place the following code into a background script and run it. **NOTE** use the sys_id that you just copied and put it into the rec.get() and don't use mine... lol
Also, the "nobody" role sys_id should be the same across all instances. If not, it's easy to find.
(function(){
gs.getSession().setStrictQuery(true);
var rec = new GlideRecord("sys_security_acl_role");
rec.get("54c7e7a3dbf5e090d0065e98dc96198a"); /* sys_id of the sys_security_acl_role record you copied */
if (rec){
rec.sys_user_role = 'b05940500a0a0aa70090a4893f6ff35d'; /* nobody role */
rec.update();
}
})();
If you refresh that ACL record now, you should notice that you have a 'nobody' role:
