You would need to create a custom gearing strategy based on Krosus or Spellblade, then save it, and it will show up in your list. We have some tutorials on how to do that: Stat weights - How to generate a custom gearing strategy
With Tomb of Sargeras, we plan to pre-calculate many more options for you: multiple bosses, different talent and gear combos, etc. It is a work in progress though, because it is a pretty beastly undertaking. The amount of CPU power required to do it is going to be a challenge…