I do plan on an advanced sign-up page that allows the kind of options
you mentioned. I'm just not sure what options would be best. Giving
too many choices will tend toward a limit of having one player signed
up for their favorite game settings and no game ever filling.
Private games is great, as is customization in general. And if they
can fill a game of a particular type with their friends, that's
wonderful. I'm just saying that too many choices is overkill and
nobody will end up starting a game when there are thousands of public
choices out there.
I'm thinking about choices like "Normal star density", "High star
density", "Low star density", combined with other types of settings,
as opposed to "give me a star density from 1 to 100".