OK, I think the feature you need was added many time ago.
Search duplicate options on Settings page for the plugin and you can set some options as:
Deactivate duplicate controls.
NOTE: If disable both controls, all items will be fetched again and again… and again, ad infinitum. If you want allow duplicated titles, just activate “Allow duplicated titles”.
Allow duplicates titles.
Allow duplicates hashes. (Not Recommended)
Jump Duplicates / Continue fetching.
You can see some help tips on icons or in WordPress Help tab.
And please be fair with your rates. The comments you say were 4 years ago and WordPress has closed the topics very time ago. The plugin was very improved since that time.
It’s not necessary doing damages to get attention. You can search for support on forums or on web page filling the support form.
best regards