A few questions on search keywords...

Hi all. I'd be grateful for experts' comments on these questions:

1. Is there a way an end-user (a reader of the WebHelp) can specify keywords in the search query (something perhaps like "kwd:installation"), such that only topics with the keyword "installation" are returned?
2. Is there a way to search across all topics that have NO keyword (eg, "kwd:"")?
3. Is there a way to configure RH such that when an author creates a new topic, a default keyword, or set of keywords, is added automatically to the search Keyword field for the topic?

Thanks in advance

-Kurt