Heureka!
Ich zitiere einmal diese Quelle (http://ponyprog.sourceforge.net/phorum/read.php?2,332):

"I enjoy to work with PonyProg. I have developed on the version v.1.17 a USB support for PonyProg with FTDI232R chip and it works for Atmel AVR controller. To join my results I would like to integrate this solution into a new PonyProg release."

"I use the Big Bang Mode of the chip. At the moment 8k flashing needs about 1~2 min.
This is my first approach and a quick hack, I work on decreasing the flashing time below 1 min for 8k."

Auf gut deutsch: FT232R-Support ist/wird in Ponyprog eingebaut!
Ich bin im Moment dabei, im Ponyprog-Forum nachzuhaken, aber es scheint so, als ob es zumindest eine funktionierende Version gibt!

mfG
Markus