Re: only using the report system when I think someone is breaking the rules. Yes I read the wiki and I understand that I can't report someone just because I don't like them or the way they play or they ganged up on me or a plethora of other complaints that don't actually qualify for reporting. I reported these accounts for breaking the first three rules as posted at
https://www.warlight.net/wiki/Rules (which is a link provided when you click to report someone, so it seems official enough)
1. You shall be respectful to other players at all times.
(Player was not respectful, even after being asked to stop being disrespectful)
2. Racial slurs, personal attacks, excessive profanity, or any other offensive language will not be tolerated.
(Player made multiple personal attacks on myself and other players, including offensive, sexual and political slurs)
3. You shall not operate more than one WarLight account in a way that gives you an advantage in a game, tournament or ladder.
(Player used multiple accounts to gain advantage in a ranked, non-team, "Diplo" game as in OP. Another player discovered multiple instances of this player using the same accounts to do the same thing in other games, also in OP)
I'm pretty sure I used the reporting system appropriately.