Kits is open-source, which means you can contribute to its development. Simply visit the GitHub page and fork the project. When you've made changes to the project, create a Pull Request. Not all changes will be applied, however.
Kits also has an API for developers; more information on how to use the API can be found on the GitHub page.
If you have any issues, encounter any bugs or want to make a request for a feature or change, submit a ticket!