[Plugin: WP Category Post List Widget] Use tags instead of categories

Is there a way to use tags instead of categories?

When cat_id is a tag id, nothing shows. If it’s a category id, everything works great.
Maybe you can have an option called tag_id that works as cat_id, only uses tags instead of categories?

Thanks,
– Joao

http://wordpress.org/extend/plugins/wp-category-posts-list/