This isn't by any means a critical suggestion, but I think it's one of those that make you go "Why Not?"  Could be just me, though.

When the All-Star list is published, attach an icon (a la the Rule 5 icons on the Roster page) to the projected HR Derby participants.  Alternatively, put these icons on the participants at the end of the cycle before the Derby, just to give us some forewarning as to whether or not we can expect our players to be in them.