We always welcome any type of code contribution. If you are interested in helping with the development, here you can find some brief indications about how to do it.
Fork, then clone the repo:
git clone git@github.com:your-username/moodle-block_ejsapp_file_browser.git
Push to your fork and submit a pull request. A tutorial on how to do this can be found here.
At this point, as we say in Spain, the ball is in our roof, meaning that now its our turn to do something. You can probably expect us to comment on your pull requests within three business days. We may suggest some changes or improvements or alternatives.
A couple of things that will increase the chance that your pull request is accepted:
Follow Moodle's style guide. Write a good commit message.