its double click but he doesnt try to deny it. i thought more people probably used it but i just looked at Szwag, startale, and player's twitch and they all use regular single click mouse to double click.. braviet says he doesn't use it and i believe him because he's slow @ lusting when you compare him to someone who does use double click.
i just designated one of the buttons on my mouse to double click and i noticed another huge advantage.. say you want to highlight a group of 9 peons, grunts, dks, ogres, or whatever ... you typically double click on one of them and it highlights the nearest other 8 similar units closest to the one you double clicked on... well if the units you're trying to highlight are moving sometimes it's difficult to accurately double click on one to get the rest highlighted. the double click button makes it a whole lot easier. you only have to accurately click the moving unit one time with the double click button
its a cool little feature to use if you learn to get comfortable with it
but yeah.. pretty much all new mice that come with more than just 2 buttons and a wheel are capable of modifying the extra buttons .. you're not gonna stop people from using double click even if you remove the file from the en.war2.ru site. might as well make it accessable to everyone.