It would be interesting if, instead of picking a schedule and the tree growing when you study it, to be able to pick learning new terms specifically, or doing a certain type/vector of question (like listening for pro users). Is there a set amount of correct questions for it to have counted you studying for a day? Because if not, that could also be an option (so if you don't have a lot of time you can set it to a lower number and if you're trying to push yourself you can set it to a higher number)
