1. Its always best to write an actual excerpt, but I know thats tedious. So, to change the ellipses to a "Read More" link, use this in functions.php:
add_filter('the_excerpt', 'my_excerpts');
function my_excerpts($content) {
global $post;
$more = '<a class="more-link" href="' . get_permalink() . '" title="' . the_title_attribute('echo=0') . '">...read more</a>';
$content = str_replace('</p>', $more . '</p>', $content);
return $content;
}
For using the_content instead of the_excerpt you can use the following in functions.php:
add_filter( 'the_excerpt', 'my_category_posts' );
function my_category_posts( $content ) {
global $post;
if ( is_category() )
$content = apply_filters( 'the_content', get_post_field( 'post_content', $post->ID ) );
return $content;
}
And if you want to remove the thumbnails:
add_filter( 'get_the_image', 'disable_category_thumb' );
function disable_category_thumb( $img ) {
if ( is_category() )
$img = '';
return $img;
}
For Justin's full explanation, see this thread.
2. Yes, the templates will work> However, the CSS doesn't account for the extra templates so none are guaranteed to look correct, though they probably will.