Not that anyone at Baseball Prospectus would be so shortsighted as to look at spring training stats when preparing for an important fantasy draft, but, um, connecting the Team Tracker to a sortable/searchable display of Spring Training statistics might have come out of such an endeavor.
There's a (temporary) link on the Team Tracker page, which takes you to the Spring Training stats: http://www.baseballprospectus.com/fantasy/tt/spring/
As with the Scoresheet Draft Aid, you can display the top prospects ratings at the top by clicking on "(show)", or sort the spring training stats on a variety of metrics. EstTAv isn't really TAv, but a formula which does a reasonable approximation, based on on-base percentage and slugging percentage. The images included here show all the AL players, which I entered into a Team Tracker team called "scratch2".