Think you found a bug? Report it! We might not know about it and it's the simplest way to help with the project.
The CTools project is hosted on GitHub, so you're free to get the source, start coding and submit it for the community.
Can't find a feature you're looking for? Start building it! We'll help you with the process and then submit it back to the community.
Once you have your own plug-in, why not tell the whole world about it? Pentaho Marketplace is a direct way to get visibility for your work.