Thanks for the review and the suggestions.

1) I'm already working on Export/Import functionality. It will take a bit of time to finish this, though.
2) I will think about changing the color or making it configurable but I consider this low priority. Let me know if this very important for you.
3) That's a great idea and something I have thought of as well. I definitely want to add something like this in the future.

One last note: RESTer is open source. If you like to contribute and add a certain feature, head over to https://github.com/frigus02/RESTer and open a pull request. I'm happy to help if you encounter any issues.