OK, but did you see on any ETPro server double jump on? I don't think so...
Maybe ET isn't so much realistic game, but I hate "addons" like fast shooting or double jump. Double jump is annoying, because lots of players make easily OBJ with it even if it's disallowed. I even don't get how it can be more fun. I try to look for servers without these things, but it's difficult to find good ones. If there is no fast shooting, there is double jump etc...
Perhaps ET isn't realistic at all, but I just don't like such things.