If you start the search wizard it looks like you described:
(http://www.pix01.com/gallery/BD01FC74-5847-4306-A29B-3AA1BF99BB82/MJ_Screenshot_._Search_Wizard/1915792141.jpg)
But if you select any entrie in the left field, the missing third field will appear. I just tested this with the actual Version of MJ (build 49):
(http://www.pix01.com/gallery/BD01FC74-5847-4306-A29B-3AA1BF99BB82/MJ_Screenshot_._Search_Wizard/1915792140.jpg)