Unfortunately that's a limitation of the engine. I think everyone here would appreciate an in-depth statistical engine, maybe one that tracks puck possession, properly tracks giveaways and takeaways, hits vs successful hits, etc. Most people really only care about goals and assists because.....well, that's really the only thing the engine does. And gives out penalties to defensemen for goalie interference.
We've tried scraping the game logs for turnover statistics, but it doesn't add up, nor does it seem rational. Frankly it feels like the engine just adds fluff in the play by play to fill in lines between penalties, faceoffs and shots.