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There is a lot of room for improvement or extension. Depending on what you want to do you eighter need to fork, extend and pull request this repository or the PMD repository.
If you want to add rules that work similarly to the ones we already have you will have to extend PMD itself.
Contributions made to PMD will not be automatically used by the Code Climate engine. You have to replace the current build of PMD in the engine with new one.
Beside extending the underlying PMD framework people could also add totally new mechanisms to evaluate code. Code would then not only run through PMD but also through other internal components. Just imagine using the Tooling Api and then reporting back on usused code across class boundaries as implemented by Salesforce.com MVP Andrew Fawcett.
