I added these lines in hopes of getting rid of the box with the suggesting new subreddits and whatnot. It mostly worked, now it only appears to "feature" stories that are already on the site.
# Changes the probability of the spotlight box appearing as a first post
spotlight_interest_sub_p = 0
spotlight_interest_nosub_p = 0
# Gets rid of the ad box at the top of the listings
ad_probability = 0