Please, please stop giving out so many of the 'prime event' boosts that has for some unknown reason been making a huge comeback. It is useless. People generally don't like the Prime event and they like the Prime skill boost even less.
Ideas for new skill boosts:
Runners on - Active with any runner on base, does not need to be RISP.
3 ball count - Active anytime the hitter has 3 balls in the count. Everyone's new favorite as it will be active in both WOH and CvsC.