+1
Force soft tabs (spaces) when using YAML syntax highlighting
When working in YAML files, you can't use tabs as indentation (as specified by the markup language) it would be good if you choose the YAML file type at the right bottom that "Indent using spaces" is forced just like in TextMate
Customer support service by UserEcho
Basically you'd want to create a 'Packages/User/YAML.sublime-settings' file and set "translate_tabs_to_spaces": true in it.