Yes, it would be cool, and it's the usual way to do these things. You can license code under a more restrictive license, and clarify licensing by adding an extr

Yes, it would be cool, and it's the usual way to do these things. You can license code under a more restrictive license, and clarify licensing by adding an extra section to the main license, adding the license to a subdirectory, or adding license headers to the individual files. Whether the MIT license is the right one to choose is probably a different debate.