Komposition is an early-stage software project. You should expect some rough edges. If you find a bug, or a place where documentation could be better, please submit an issue on GitHub.
If you want to help develop Komposition, look around the reported issues on Github if there's anything you can pick up. Issues are labelled to make them easier to find, and you might interested in the following tags if you want to help out:
However, as this is a highly opinionated piece of software, discussion prior to any change is highly encouraged. It would be very sad to reject your pull request becuase it hasn't been properly planned beforehand.