When I type in text-indent it highlights 'text' as if it was a property, but '-indent' shows up as regular text.
The CSS syntax highlighting, which I guess this plugin inherits from, does highlight text-indent.
Grr, looks like that's because text-indent is highlighted as cssTextAttr (the same as underline, blink, and the like) rather than as a cssTextProp. Not a big deal in css.vim because those are highlighted the same by default, but sass.vim is a bit stricter in what it allows where. Can you email the css.vim maintainer (Cc me) and explain that?