We introduce braids.social, a client application for decentralized social media that enables users to configure the algorithm that controls their feeds. Mastodon has become one of the leading decentralized alternatives to Twitter. However, its reliance on chronological and fragmented feeds—meant initially to avoid blackbox algorithms—has made it harder for some people to curate their feeds. braids.social allows people to combine various feeds and prioritize different content categories in one feed using easily configurable rules. We evaluate braids.social with ten active Mastodon users. Results demonstrate that a unified feed assists with discoverability, and the rules-based approach offers users a convenient way to adapt the feed to their preferences and catch up on content. However, users are unwilling to fully replace their chronological timeline with braids.social's feed, rather considering it a supplement or secondary option. Finally, users enjoy seeing visual affirmations of their understanding of the algorithm but still desire constant reinforcement of how it works through feedback mechanisms and onboarding features.