I'm away from my Mac, so I can't check the status of this in the dev database - may want to email the
support ninjas if you want to be sure this gets recorded; we browse the forums as were able, and the iPad edition has us pretty busy on the email front.
Just in case it helps: I find that using the View menu to add the date-related columns to the outline view & then typing dates and navigating between cells with the keyboard is by far the fastest way to handle them. Plain English stuff like "Next Wed" gets handled as you'd expect, too.