Can I configure a 2.0 memory stick to always power up as 1.0 and only 1.0? Can I do this on a PC, for example, and the 1.0 programming will remain if I switch the memory stick to an OS-9 MAC?
You can't program a stick to use only the USB 1.0 version/speed. The memory stick will use the default USB version where it's going to be plugged to. The speed can't be adjusted.