YAML configuration files could be made less verbose and more human-readable/editable by removing curly braces and commas.
Indeed, according to Wikipedia:
YAML 1.2 is a superset of JSON, another minimalist data serialization format where braces and brackets are used instead of indentation.
Most .yaml configuration files in the current codebase have these extra curly braces and commas. We could clean these files and use python-style nesting/indendation. Tools such as http://www.yamllint.com could help with the transition.