more filters in search page

in the forums search page i.e. in [https://www.sdn.sap.com/irj/scn/forumsearch|https://www.sdn.sap.com/irj/scn/forumsearch] ,

the current fields are:

Search Terms:

Category or Forum:

Date Range:

Results Per Page:

Mostly i want to see if the the threads are already answered, to quickly find the most relevant threads.

Would it be good to add one more field (a filter infact):

Answered Status:

(it could be a dropdown with the values "All threads" (default), "Answered threads", "Partly answered threads" and "Open threads".. something like that.)