To be clear on my own suggestion, I think the baseline of structure has to do as much with motivation-initiative, regulating challenge, and assignment navigation as with behaviour and discipline.
Also, Csikszentmihalyi's ideas on "flow" have much to say on all this. He really gets a lot of things right, e.g., his views on the need for a challenge-skills match fit well with mainstream ideas re learners as self-regulators.