It's not as easy to find an example of (it's primarily used in the custom race builder), but if the CustomCost.2 tag is present on an ability like a domain, that should make the ability cost 2 slots instead of the default 1 slot. This way, you don't need any script to alter the cost of the domain. Tags are added through the Tags button on the right-hand side of the editor.
I'm afraid I'm in the middle of a project and don't have time to look up your second, third, fourth, etc. questions right now - if no-one's gotten back to you by this weekend I should be able to delve into that and refresh my memory on how this works in this game system.
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