filter out emails with replies in the object record activity feeds

I would love to see the ability in the object record activity feeds to filter out emails with replies -- object records being any filed record (contact, company, deal or ticket). I am in the process of merging records and would love to be able to pinpoint which interactions had back-and-forth actions.

PLEASE-- this would be so incredibly helpful.

The 8 emails our rep sent are not as important as their single reply