A GtkVScale that can be given its own GtkAdjustment settings has no configuration issues whatever.

Reasonable settings on an adjustment object for a GtkVScale on a single full page might look something like this:

<?php

$adjustment = &new GtkAdjustment(0, 0, 100, 1, 25, 0);
$vscale = &new GtkVScale($adjustment);

?>