If these other methods aren't in the JSONWP, they should likewise not be here. Adding a method to routing.js doesn't make it available to clients. Client libraries have to specifically implement functionality for new endpoints, and unless you're going to go and change all the client libraries, this will be a meaningless addition.

What client libraries _can_ already do is use executeScript in order to call the `mobile:` methods. In other words, take this line out, and you'll still be able to use the functionality by doing `executeScript('mobile: rotate', {...})`