Advanced use of Seed Lists in email send outs

[#1]

There is a Seed List feature in AJO when it comes to use of Seed Lists, but that needs to be further developed. Today the Seed List is configured on the email surface. That means that you cant decide if you want to use it or not, when the surface is used. F ex if you have a marketing surface and you use that surface for "all" your emails, like onboarding, sales and Newsletters. Whatever you are sending with that surface is using the Seed List even it is wanted or not. 

A use case is it Customer service wants to know what has been sent out in a mass sending, like a Newsletter. Then the Seed List works great. But it you then use the same surface for your onboarding activities, customer service gets a copy of each and every single email that runs through the onboarding prosses.  

Our ideas is if you can decide from the email node configuration if you want to use a Seed List or not. And if you also could select from a list over different Seed Lists, who you wanted to use, this would be great. Then you have the option if you want to use a Seed List for this specific email or not, regardless of surface, and you could also use different list for different emails, in the same Journey.