I am interested in ways to use computer programs to procedurally generate worlds. The worlds would be random, but their generation would follow well defined rules. While I know that programming questions regarding this would be off-topic here (there are plenty of other stack exchange sites for that), would questions regarding the design of the "world generation rules" be on topic? For example, questions of this type would look like "What are methods for simulating when one species splits into two?" or "What properties of a region affect the rate and demographic of immigration?" when they are looking almost mathematical ways to define those processes.
thurizas raises an interesting sub-question in the question comments. Should we welcome algorithm questions like diamond-square versus uplift? I think that algorithms for generating worlds should be on topic (whether step by step guides to the order in which to build up a world, or abstract algorithms for generating terrain). However, the type of question asked is still important. If the question is just "How does the diamond-square algorithm work" then I would consider it off topic. An on topic question would be something like "How similar to natural rock formations are the terrain models produced by the diamond-square algorithm?"