[search] smart search like in jira to limit scope to a space

jira has a nice feature in the [quicke search] box on the top right that is called "smart search":
when entering the key of the project as the first word the search is scoped to that project only.

i'd like to have that very much in confluence too!!

EXTENSION
it would be nice to be able to select several spaces to limit ur search scope. eg: search in spaces A,B from A-H. but hat is a topic for the advanced search not the [quick search]