Dear J Mesquita Mesquita,
To be honest, I do not know why Moodle does not have this course format already, but would think that it would be down to demand - possibly.
To progress this further and give potential developers a better idea of the proposed format, could you produce a mock-up in say a paint program? This would help visualise the concept and pin down the specific requirements that facilitate the course format to be created and tested against. With this I think it would be possible to submit an enhancement request on Moodle Tracker - http://tracker.moodle.org/.
Courses and course formats
Week-DOW (Days Of the Week) The excelent and brilliant concept for the truly needed Course Format
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