These add-ons see pretty frequent use, especially over on /r/medicalschoolanki, but we don't really have any data on their long-term effects. If we could play these review schemes through in our simulator, I feel that would allow users to draw more informed decisions on their use.
So this might be out of the scope for the add-on, but I think it would be neat to also take a look at custom review plans as the ones implement by load balancer, Load Balanced Scheduler, or Free Weekend - or Any Other Day.
These add-ons see pretty frequent use, especially over on /r/medicalschoolanki, but we don't really have any data on their long-term effects. If we could play these review schemes through in our simulator, I feel that would allow users to draw more informed decisions on their use.
Same with add-ons like Postpone card's review.