Well, I just got a .098. But I'm not gonna say that was entirely true. My real best was .215.
For the curious ones, I got the .098 by using TAB and ALT+TAB to cycle between the two buttons, and i just hit enter immediately.
ex(Start on the Start button, Enter, TAB, Enter, ALT+TAB, Enter, TAB, Enter, etc.) Basically i kept doing it until it did one of the immediate background switches and thus .098
*edit*
Just got a .088 but anticipating the change. I got a bunch of "you pressed too early" but then i got one. And yeah, I know it's cheating and it isn't what the program was made for, but thats why I posted my real best at the top.