I don't know how that is possible, considering that many if not most applicants haven't taken Step 2 (or at least haven't reported their score) by the time applications are sent in. While you may get asked about Step 2 in passing during interviews, it is not very likely to change your ranking by the program... and your score will probably be available too late to help you get an interview if you are a first time applicant.
The bottom line is this... programs like high Step 1/2 scores, A) because they can (given the large number of applicants to sort through)

they are predictors of good standardized test-taking skills (and therefore predictors of higher OITE scores and higher passing rates on boards... both good for the programs)