[Lizard]

There's a couple shortcuts.
1) Type a date in the due date field on the inspector. It understands partial dates like "tomorrow" or even "tom" or "January" or "Fri" or "2d" or "1w".

2) For even faster access to the due date field, go to the View menu. From there, choose Columns, and then Due Date. This should add it to the main view.