Often I come across discussions where I want to reference a similar discussion I have commented to earlier (or I remember the author of someone else who posted a comment) and I find this very hard to search for as I only seem to be able to search by the author who created the discussion, which is not really useful.  So it would be useful to have a "Comment Author" filter.  

Also it would be useful to show comment author in search results, because at the moment if the search term appears in a comment to a discussion the seach results shows:

Title of discussion which is linked to opening post

Extract from comment highlighting search term

 

Forum Discussion by User X | Date_of_Creation | Y comments

So it would be useful if it showed:

Title of discussion which is linked to opening post

Extract from comment highlighting search term

 

Forum Discussion by User X | Date_of_Creation | Y comments | Comment by User Z on Date_of_Comment

where  "Comment" in last line above is a link to comment (i.e add "#comment-comment-id" to URL of post)