Hmm no… not at all. It is just hard to get a good UX with an emulated Wii Motion Plus, not to mention that since they can still be bought, it's a lot of trouble for an inferior result. So far no one has bothered to implement it in 4.0. If you think it is that easy to do (and are able to write the code for it), feel free to try it. Don't forget to submit a pull request 
Also, I'm not a dev here, but I'm pretty sure that Dolphin's source has changed a lot between 3.0 and 4.0. And it still changes almost every day. Sometimes, porting a feature from a legacy codebase is even more difficult than writing the whole thing from scratch.
Also, I'm not a dev here, but I'm pretty sure that Dolphin's source has changed a lot between 3.0 and 4.0. And it still changes almost every day. Sometimes, porting a feature from a legacy codebase is even more difficult than writing the whole thing from scratch.