The Altera Centauri collection has been brought up to date by Darsnan. It comprises every decent scenario he's been able to find anywhere on the web, going back over 20 years.
25 themes/skins/styles are now available to members. Check the select drop-down at the bottom-left of each page.
Call To Power 2 Cradle 3+ mod in progress: https://apolyton.net/forum/other-games/call-to-power-2/ctp2-creation/9437883-making-cradle-3-fully-compatible-with-the-apolyton-edition
If you mean setting the default build order in an individual game, the hotkey to save a production queue as the default is Shift-Q (source). Then tap Q in a city to load that default production queue.
If you mean setting the default build queue for a scenario, I'm not aware of a way to do that - it seems the scenarios I've played usually have every city building the exact same thing at the beginning. If there's a way to do this, the place where people would know about this is http://forums.civfanatics.com/forumdisplay.php?f=46
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