thumbnail excerpt plugin

Im using this plugin to show excerpts of my posts which include a thumbnail at the top. It works, however i still want to be able to configure the number of words are shown in the excerpt to about 10 words, 55. I would also like to have the More link added at the end

Can i still do this while using the plugin? Ive been trying to mess with it searching but cant get it right. this is my function.php:

<?php
if ( function_exists('register_sidebars'))
    register_sidebars(2);
?>

and my index.php if needed. thanks

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