As I understood this option works for newly important files, right?
If you queue them from a search result, they arent paused..
Setup > Download > Import already downloaded as paused, Keep download history for last X days.
It does exactly what it says. If the files aren't older than the days you specifiy for your dl history, they will be paused in the queue, whether imported from a file or from a search engine.
The easiest way to verify this kind of feature is just to try it for yourself.
-Hecks