i would modify board.txt if i could find any info on what needed to be changed. when i did this for arduino23, all i had to do was modify programmers.txt. as things stand now, i can't use arduino1.0.3 -- which is just as well considering how much code of mine that it breaks (arduino.h, really?). but i would like to try out some libraries written by others for it.
avrdude -c pony-stk200 -p m328p