Adding Custom fields

Hi,

It’s a great thing to be abale to add Custom post type but it would be even better to be abble to add Custom fields in the newsletter.
If it’s too complex to integrate it in the email builer it could be simply HOOKS with add_filter in functions.php.
It’s very useful because most of times when you work with custom post types, you have custom fields attached.

Could be great also to be abble to have a multiselect in posts lists instead of adding one by one…
thanks