Manual seeding is pretty self-explanatory. It says "This method is best if you want to seed a new stage based on results of the previous stage"
But what about Automatic and Random? Is each stage seeded by rank and randomly, respectively? Or are future stages able to be seeded manually?
Ideally, I'd want the first stage to be seeded randomly or by rank, but future stages seeded manually or randomly (my choice). But it's not clear to me what will happen with Auto/Random on following stages.