There are a number of presentations in Elementary that are meant as impressionistic and not really meant to be practiced or mastered. Experiments and Chart presentations work like that. It is the follow-ups done by children that need more focus and followed up rather than the presentations themselves.

Can a new type of lessons be introduced - say Impressionistic Lessons which neither fall under Masterable or Ongoing?

As of now that option seems unavailable for the Admin. Can that option be introduced?