I don't think a population size management algorithm would be necessary, why not simply have an algorithm to keep the people moats likely to get along and be productive together in the same instances. I know that, in an infinite life I and probably many others would be happy to devote some of it to the problem of capturing more stars and or other means of obtaining ever larger quantities of power. We could possibly be infinite (and probably Viewed as evil 😕.) but we could Atleast live much longer and have a vastly larger population than a simple fleshy existence on inhabitable worlds would allow.