What would make it better (imo) is an option that would let you select the kills you wanted to watch. Like it's own tab. Or maybe even multiple watch lists. I could have a Blood Sail's pirates page, Bogflare page, a rare's page. And these items would be saved even if they would normally drop off.
I did use it for a while and kept getting an error. I'll redownload it and see what it was.