WordPress.org

Extra Configuration

Allow other members to use traditional blog comment reply

Edit the theme file theme/activitycomments/blogactivity-commments.php (you may want to copy this activitycomments/file to your default theme to prevent future updates from overwriting)

change the line

<?php if ( comments_open() && is_site_admin() ) : ?>

Where is_site_admin can be current_user_can() with the wp_cap level (lets say you want editors or authors to reply to comments in the traditional sense). Then additional blog_comments will show activity replies underneath as well. (a neat nested effect)