Course progress

Hey guys,

first of all i wanna thank you for the great plugin!
I want to use the courses without lessons. When a customer buys a course he gets the progress status. Is it possible to assign a customer as completed in the backend? When i remove the customer in the learners section and he login, the learner is back again. So the course must be completed, otherwise he cant buy it a second time. I use thisa plugin to sell offline courses aswell and so it must be possible to sell a course a second or a third time, without the progress. Hopefully understandable ??

Thanks in advance
Cheers Manuel