I have to dissagree, Martin. Just my own observations, of course, but there has to be a certian threshold of delay or lag involved even with the fastest clicking possible for this particular exploit to work. On the rare occasion where I get enough lag I have seen the effect but I'm not going to purposely slow down my computer to take advantage of it. If it won't work the same for everyone playing the game then many people won't want to play the game any more.
It's possible on any computer, but you have to click fast. It's easier on slower machines, though. Many good levels have been "destroyed" and/or gotten a new "challenge" this way.
I don't begrudge anybody a good score, in fact more power to you for finding a way to do it. My question, though, is whether or not exploiting a lag glitch is reproducable on anyone's computer, playing the game normally. If not then this is the kind of thing that will truly kill the game.