In the latest release, deletion is once again improved.
No longer should you find a course without a delete option.
In addition, I've made deletion more flexible. You can delete a course and its lessons, or only the lessons - there are separate menu options for each.
When deleting a course, you have the option to specify for which period lessons will be deleted, and to select a custom set of deletion dates by way of a calendar popup. Just click on the dates to modify them.
