I just noticed you are losing a great subject line in the automatic newsletter mode. You should allow to use a very great feature implemented in Feedburner, which is the post title + N more news.
Currently, you only support the [newsletter:total] shortcode, but it would be WONDERFUL if you add another one saying something like [newsletter:totalminusone]. That way, people can create subject lines like, in example:
[newsletter:post_title] and [newsletter:totalminusone] more news
What do you think? That's a very nice feature and everybody moving off from Feedburner to MailPoet will appreciate this implementation.
May you take this into consideration? Thanks in advance.