Automatic scheduling when a project is imported
I often use checklists to prepare for events; I would like to reuse the checklists for a repeat of a similar project. Therefore, I would like to specify the due date for a task to be "Due 48 hours prior to @Launch", for example. When import the file, I could add a definition line at the beginning of the file which defines the meaning of "Launch" to be "6/9/2013 10:00".
A cleaner alternative would be to use a specially formatted hashtag to define the event. If the tag @Launch were defined to be a valid date at the time the project were imported, it would be evaluated in computing the due dates.