full Thumbnail display in "what's New/Latest Activity" thread view

[aggrovated]

Hi all,
I've been searching for days on how to implement full image thumbnail (from attachments) view in "what's New/ Latest Activity" thread view. Additionally I would like to implement this feature within "forums list" view as well. Are there any add-ons that can do this? or is this feature already built in?
My thumbnails are not full image like these examples. They are truncated, cutoff around the edges. I'm not looking for full size thumbnail images, just the complete "whole" image in...

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full Thumbnail display in "what's New/Latest Activity" thread view

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