Smart collections allow filtering on capture date and edit date, but not date added. However, date added is metadata that Lightroom has, as it's sortable. All the dates in the metadata should be exposed to smart filters, particularly date added / imported.
My workaround is to add a keyword with the importdate that I then can use to filter. But it would be much easier if added/import date is a default filter so I can have a smart filter that looks for all photos imported in the last 2 days (for instance).
For culling I use smart collections that look for photos taken on a certain date that have no flag. I'd rather look for photos IMPORTED on a certain date (or in a certain time slot)