Symbol listing and navigation (via the builtin symbols-view)
Diagnostics (via linter and linter-ui-default)
Highlighting references (put your cursor on a token and see all other usages of that token; used via pulsar-find-references)
Ability to do smart project-wide renaming of certain tokens: variable names, animation names, etc. (via pulsar-refactor)
Configuration
The settings under the “Server Settings” section correspond almost exactly to the settings exposed by the language server. When you change a setting in the UI, it applies to CSS, SCSS, and LESS all at once.
If you want to override a setting for just one language, use a scope-specific override in your config.cson: