extend table class

hi,

I have installed your plugin on a site. Now the site onder wants to add an extra column to the pricing table. I managed to edit the table.php file, so i could add an extra table head to the array and an extra row to the rows array. However, to make it futureproof, i want to extend the Table class outside the plugin, so updates wont effect it. I tried to include the class file in a code snippets plugin, but that doesnt seem to work. Is there a possible way to access the Table class outside the plugin or to approach the public function getHtml(); ?

Looking forward gearing from you,

Kees