Today you are able to license your module by using License keys and Configuration Keys. If a license is not deployed elements that are part of the License keys are not shown i User interface. But with executable code you explicit has to wrap your code with with conditional statements asking if Configuration keys are enabled. It would be nice if you could actually put Configuration keys on classes and extension classes, or even better, put a Configuration key or License key on a model to prevent AX from loading classes or models at runtime.