Ben Robey contributed to the cmss13-devs/cmss13 repository by developing a streamlined alt-click interaction system for reagent handling, enhancing user experience in gameplay. Using DM and object-oriented programming, Ben implemented backend logic that allowed players to quickly fill or dump reagent containers via alt-clicks on sinks and hydroponics trays, reducing repetitive actions. In a separate update, Ben addressed a critical bug affecting hijack state persistence for groundside xenomorphs, introducing a new state flag and updating spawning logic to maintain correct hive assignments after hijack events. The work demonstrated focused feature delivery and robust backend development within a short engagement period.