Freron MailMate

At present, at least in the columns I display by default, I can right-click or shift-double-click to activate the searching for similar items in the following columns: From and Subject. This is great feature (as I marveled about it on the mailing list). Could you please extend to to additional columns? I am specifically interested in:

Date received -- search for messages sent on the same date
Attachments -- search for messages with any attachments (or no attachment as the case might be)
Tags -- search for messages with the same tags (popup can offer searching for one of the tags if more set)
Flags -- search for messages with the same flag (popup can offer searching for any of the flags)
Read -- search for messages with the same state
Source mailbox -- search for messages in the same source mailbox

I do realize that some of these can be accomplished by changing the column sorting and then scrolling accordingly. That, however, affects the column settings and needs to be reversed. Search for similar offers a very graceful alternative and leaves in view only messages of interest.