Smart playlist: Filter for relative "Date added"

Hi,

a relative date filter for “Date added”, in addition to “Before” and “After”, to select items added in the past X (configurable) days would be nice for playing recently added items only, especially if there are a lot of unplayed items so the “Play count” filter won’t help. In addition (or alternatively) a “Select” button for “Date Added”/“Last Played” would be useful.

Thanks,
Riker