[eluser]PhilTem[/eluser]
If you want something to be in the latest release you need to fork the GitHub git of EllisLab's Codeigniter, make your changes and do a pull request. If Ellislab likes your code, they might integrate it, otherwise you need to get your code otherwise published (e.g. by posting a link to your git here in the forums).
The best thing though is to write your code and publish it using GitHub.