Like Mike said, you can copy the settings in LTIauth.conf into the course.conf of the course you want to enable LTI for. We've successfully done that on the MAA servers.
There is one instance where we did not have success, but we haven't figured out the problem. I think it is likely to work if you try it.
Jason
PS - feel free to email me if you run into trouble.
Installation
LTI auth only for some courses
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