Right now Gerrit allows to star "important" changes. This is a very useful feature.
Internally we have received a feature request to have this concept extended a bit. Instead of a single type/color of a star it would be great to support more colors (ex. yellow, red, blue) to help one to organize their work.
This request may have some common ground with #227 and #992 but the most important bit of it is still not captured on those: the ability to visually capture at a glance all "red" marked changes as they are the most important (in the mind of the user using such a practice to mark their changes), etc.