Plugin TAG - search with tag in global search and knowledge base search

I can tag items such as Project Tasks and KB items but I cannot search for them or even filter for them via TAG, so being able to tag them is almost pointless. 

Can we add the ability to search by tag in the global search as well as in the KB search. Could be by prefixing with # like #hashtag in the search or simply by treating the search text as a possible tab.