First off, thank you for considering contributing to Gecko. It’s people like you that make open source thrive, and make Gecko a great tool.
Gecko is under continuous development. If you have requests for features, please file an issue describing your request. Also, if you want to see work towards a specific feature, feel free to contribute by working towards it. The standard procedure is to fork the repository, add a feature, fix a bug, then file a pull request that your changes are to be merged into the main repository and included in the next release.
Here are some tips that might help - How to contribute to the project