Hmm, I'm pretty sure the Amiaga's PCMCIA port could do faster than USB1.1, surely not USB2.0 but still a little faster.
I'm saying this because the Squirrel SCSI interface reaches 3MB/s (more, around 3.5 I think) wich is ways faster than USB1.1 (12Mb/s = 1.5MB/s)