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For your first part, I think you're using "admin" accounts in a way they are not really setup for - i.e. "I want these users to be admins but I want to control what they can/cannot do" - the idea of an admin account is that they basically function as a master admin but just can't mess with ACP stuff. So I'm just not sure how to make that work for you in an easy way other than turn the notifications off (which you can do right now). Notifications default to email, which we want otherwise most of our users will wonder why email is NOT working for them after they have enabled a module and are trying out a new feature.
The second part I will take down as a feature suggestion, although making it part of the quota also runs counter to the idea of the admin user being aware of what's happening on the system, but I will see if there's a way to get the desired effect.
Thanks!