I saw this feature at the custom_projectview.inc.php.
But how can I use this custom_projectview?
What's the sense of this view?

Futher I would like to now if everybody should have the new labels like "important", "3d" etc?
Or can everybody have it's own labels in it's local streber?

I ask this because we still have the old labeling like "Enhancement", "Refactor", etc. and cannot set the docu to "important" like you describe above.