I have a question about Rengar...

I was told that some players have been setting their keyboards or mouses up to make one of Rengar's abilities go off 4 times or something like that? Like, being able to press something so many times in so many seconds that isn't physically possible? Can anyone tell me if this is true? I have seen a lot of Rengar players do a ton of damage, (as in over 2200 in 0.56 secs, which just happened to me last game) so if people are using this technique with Rengar I would like to know, if Riot are going to do anything about it. I have had a Rengar jungler in the enemy team almost every game and it is getting boring getting one shot all the time, even when I ain't playing ADC. The cooldown on his ult seems non existent.
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