Brackets is fully extensible -- here's a getting started guide for writing extensions: https://github.com/adobe/brackets/wiki/How-to-write-extensio...

The powerful thing about Brackets is that extensions (and the rest of Brackets in fact) are written in JavaScript, so basically every Brackets user has all the skills necessary to write an extension and customize their development environment.

We don't have an easy way to customize key bindings yet, but it's on our backlog: https://trello.com/card/keyboard-shortcuts-stored-in-json-fo... https://trello.com/card/keyboard-shortcut-customization-inte...