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The modification required for working with registry globals off is not very difficult.
You have to identify all the names from the input fields in forms (also the hidden ones).
eg.:
echo "hidden" name="id" value="$id">n";
for variable id.
At the beginning of processing the form you add for every variable name eg id:
$id = isset($_GET['id']) ? trim($_GET['id']) : '';
$id = isset($_POST['id']) ? trim($_POST['id']) : $id;
If the variable is an integer number, you add also this:
$id = intval($id);