There should be a way to send an email asking somebody to input something. This input could be used as dynamic content. It would be nice to allow a user to change a variable. For example, asking a user what time something should be or giving the option to change a time. It would also be nice if there was a comment box for email with options. Personally, that would solve my issues, but I feel like a general "Ask user for input" could be more valuable for its wide variety of uses.