If anyone's interested, I was able to create the framerate hack for Starfox Assault (USA version). Runs pretty nicely, although a few subtle glitches are introduced.
AR codes:
60 fps [biolizard89]
04385AF8 42700000
0403AF2C 60000000
04385B00 3F800000
0403AF28 60000000
04385B08 3C888889
0403AF34 60000000
75 fps [biolizard89]
04385AF8 42960000
0403AF2C 60000000
04385B00 3F4CCCCD
0403AF28 60000000
04385B08 3C5A740E
0403AF34 60000000
120 fps [biolizard89]
04385AF8 42F00000
0403AF2C 60000000
04385B00 3F000000
0403AF28 60000000
04385B08 3C088889
0403AF34 60000000
AR codes:
60 fps [biolizard89]
04385AF8 42700000
0403AF2C 60000000
04385B00 3F800000
0403AF28 60000000
04385B08 3C888889
0403AF34 60000000
75 fps [biolizard89]
04385AF8 42960000
0403AF2C 60000000
04385B00 3F4CCCCD
0403AF28 60000000
04385B08 3C5A740E
0403AF34 60000000
120 fps [biolizard89]
04385AF8 42F00000
0403AF2C 60000000
04385B00 3F000000
0403AF28 60000000
04385B08 3C088889
0403AF34 60000000