I had a look at what's entailed in doing a pull req before, and read the CONTRIBUTING.MD file. I was left unsure as to what versions of CF and Lucee need to be supported. Might be worth adding that?

Yeah mate, that needs to be made clearer for sure.. better info is buried here https://github.com/cfwheels/cfwheels/blob/develop/src/docker/README.md

Yeah that stuff should be in the contributing file I reckon. Or at least a link-to, if it's needed there too.