Add API calls to save and load user information (user.save and user.load)

I'm integrating a Drupal with another site where I handle the registration and user management. When a user registers to this site I need to also create a user on a Drupal site. When a user logs in to this site I need to also login to the Drupal site. I think all this could be done if there were a way to create a user by calling the user services module. I think it is not hard to add two methods to the user api: user.save and user.load which work similar to the drupal user_save() / user_load() methods in the user.module. Is there a reason why this hasn't been done? I am willing to write this code and provide a patch if people are interested. I certainly am. I could create a module for this but I think it would be more useful to integrate it to the user services module.