Thanks for the fast response!
I’m migrating lists from PHPlist and mailchimp. There are a few things that can be customized separately list in both PHPlist and mailchimp these that would be great to see in your plugin. They are:
1. User email templates (confirmation and unsubscribe most importantly, but would be great to have separate templates for each list for the posts email, latest posts email etc. too). Could you move “Email templates” out of “Configuration” and make it a separate menu item? Inside of that menu item there could be the option to set the templates separately for each list.
2. Per-list subscribe forms. Instead of having one “Default subscribe form” setting, you could use a separate menu item for “Subscribe forms” where the form for each list could be customised. Right now I have to use a javascript hack to change the button text for different forms, for example.