Making trisquel.info search more user-friendly

I have a few questions about features that would make the site search on trisquel.info more user-friendly.

* Is there any way to make the search function only search among forum threads (or only wiki pages or whatever)?

* Is there any way to search within a particular date range (eg last 2 years)?

* Is there any way to get the search function to present the most recent comments containing the keywords at the top of the results?

* Is there a way to exclude locked threads from search (eg I want to continue an existing thread on a topic rather than starting a redundant thread)?