Hi Greg,
I spent a few hours trying to do this by writing custom code and a bunch of other stupid stuff when all you need to do is go into Catlist.php and change:
$lcp_thumbnail = get_the_post_thumbnail($single->ID);
to
$lcp_thumbnail = get_the_post_thumbnail($single->ID, 'medium');
or whatever size image you want from your set media settings sizes. You can also check out this plugin if you need more image sizes. Haven’t tried it, but it may help.
Fixed it. I put the list in a post that was in the category listed. I created a loop. Duh!
I third this motion! Counsel is correct on the matter. Renaming image file names is a pain. It would be a definite improvement.