You can add it to the recordset directly just like you referenced in your code. That works. You have three options.
1) update it in the rsobj.php file (it won't be updated unless the version is updated. You can set the version to a very large number and it will never be updated)
2) update it in the recordset with: $rs->CrossSiteProtect = false; (you can do this at any point, even half way down the page if you want)
3) in each reference to $rs->getColumnVal()... you can turn it on in each reference if it is turned off in the rsobj.php or off when you want if it is on in the rsobj.php file