Hi!
Yes, sure. You can define your own templates for rendering a featured post. Just define a template in which the featured image takes the whole width and is presented as a rectangle, not a cropped square.
The plugin includes a couple of examples. The one named title-and-featured-image.php is almost what you need. In particular, there’s the following block:
<div class="featured-image alignleft">
<?php
echo $open_link;
echo get_the_post_thumbnail( $post->ID, 'post-thumbnail' );
echo $close_link;
?>
</div>
just change it so that it’s no longer aligned to the left and use the full size image (or any other dimension you might be interested in, such as medium or array( 400, 150 ) ):
<div class="featured-image">
<?php
echo $open_link;
echo get_the_post_thumbnail( $post->ID, 'full' );
echo $close_link;
?>
</div>
Remember you can further tweak the look and feel of the featured post using CSS rules.
