I once followed a discussion in a different forum about such functionality. After all I have read about it I don´t think Phex will ever implement that. I believe it is more than comfortable to start a search and choos a variety of files from the result which Phex will then download automatically. Downloading all file swhich match a certain search would seriously decrease the net´s performance. And as you would most likely dump 90% of the downloaded files it really wouldn´t be worth it.