Complex unit planning.
I teach high school English and have large, thematic units. I would love it if the unit blocks were larger and had tabs (similar to the lesson blocks). I want space to not only list the various lessons that will be incorporated into each unit, but also space to keep track of notes and materials for those individual sub-units.
When I teach a novel, for example, if I build that information into a lesson it isn't easily accessible for the entire unit.
Have the ability to add multiple templates together to create a unit.