When somebody buys a book can a setting be saved so that when we create a new character the toggle for that content will be on by default? I mean we don't buy the book to not use it for characters.

Would save on the bajillion "I bought X book but Y content not showing! Help!" posts.

I've not yet come across a campaign where the DM's stance wasn't "anything official is fine but check with me about UA or Homebrew". I mean, I don't need to play in an Eberron campaign to use a Dragonmark race, you can easily incorporate into a FR based campaign. The DMG encourages DMs to make edits like this. So there's no reason to disable it by default after purchase (or before, really, I mean Content Sharing's a thing). I daresay there are more people wanting to have it on than those wanting it off. It's not like the Marketplace tells you that you have to specifically enable it to use it. Hence, so much confusion because the logic is "I bought it so I can use it".

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Also, can we have a section in our Account where we control what toggles are on and off by default? Some of us love making characters, even if we never play them (you even mention this in your recent ad!) for various reasons and having to edit the toggles Every - Single - Time is a mild annoyance.

An option to set your own defaults would be nice. Not high priority, sure, but nice.