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I'm in favor of a standard round-robin format, but definitely with three points for a win and a golden match for 1st place, if needed. I don't care about the castles. The same goes for the templates; the main thing is to avoid anything too extreme, like balance-focused gimmicks.
Added 6 minutes later
I also like the option of banning 1-2-3 castles for a specific opponent before the start of the game. This will add more variety to the tactics.