Yeah I read through all 40+ pages of phlsphr's tut. I saw where folks were wishing it was faster and by using that equation and a little math I figure changing to a 10k pot and adding resistors in series would allow you to tweak that 6.87 to something faster.
This weekend I plan on building a new circuit with the 10k pot and a 47k & 10k resistor in series in place of the usual 10k resistor called for in the tut. Hopefully about 18 shots per second tuned down with the pot won't be retarded.
the shots per second are limited by the software meaning the game limits the shots per second.
I know it seems logical to change the values of Rs and C then bada bing faster fire rate it doesn' work that way though. after you get to a certain point it slows down if the timer is sending out more pulses the game doesn't register and you get erradic fire. the purpose of the potentiometer is to give you a range from something like 2-3Hz to prolly 15Hz or so. in this range is usually what the game allows.
you can make a timer do a million pulses a second, but the game will never detect that many.
hope that helps