Include RAT and Keylogger logs.
Including things like this (http://pastebin.com/4fJAYTRt) would be a good addition to those who have been infected and do not know about it.

Already implemented in the paste service.
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These will *usually* be picked up by the paste monitoring service described here: http://www.troyhunt.com/2014/09/introducing-paste-searches-and.html
I suspect the main reason that one wasn't included is because it's now a couple of years old and pre-dates the @Dumpmon service that HIBP depends on for data. I've just manually added that particular one so you can now see it in the results like this: https://haveibeenpwned.com/account/andrejabar@gmail.com
I'm going to close this idea off given it's already done.