There are numerous attributes that could be used for a hockey sim that aren't reflected in the SHL. A major one that exists in FHM (and EHM) would be "Getting Open". The attribute sort of exists in STHS in the all important and blanket rating of Defense. I'd like the two to be separated, both for more interesting builds, and less confusion for new players. It might be a odd adjusting to more attributes in general, and may very well eventually lead to some "cheese" builds, but for a while at least, it is an interesting prospect to work with more attributes. Another good pair would be the "offensive" and "defensive" read stats. They would surely be an important set to work on, whether you're loading up on one early, or trying to balance to create a good two-way player.

Most importantly, I'd like a sim engine that would respect the long forgotten advanced analytic: Fast, Attacking, Supportive

The crucial stat that has been lost to time needs a place in modern hockey, so we may truly evaluate who has been naughty, and who has been nice.