We have an issue where attachments do not always result in the user being taken to our custom landing page. They get flagged for opening the attachment, but they are none the wiser that they've been a part of the test.
It would be very useful to be able to select the types of email we'd like to go out. Links, Excel Attachment, PDF Attachment, etc.
Currently we have to go into system templates and just hide the ones with attachments.