Add Featured Image

OK, I see there is a kind of connection between the Recent posts plugin and this widget.
So, same question here as I asked for Recent Posts plugin:
I'd really like the featured image added tot the things this widget "pulls" from the sites in the network...
See this post as well:
https://premium.wpmudev.org/forums/topic/sitewide-recent-posts#post-298514

Thx and cheers!