I have used the USB 1.1 port on an Apple keyboard to run an Epson printer.
No problem.
The printer is powered externally, not via the USB port, so a low-power USB port like the one on the keyboard is fine.
I have not tried running an external CD writer from the USB 1.1 port on the keyboard. For one, I think USB 1.1 may be a bit too slow for a fast CD writer; there may also be problems if you want to use that external writer to boot up the Mac from the disk. Maybe the USB 2.0 por on that keyboard works since it just seems to be an extension of the USB 2.0 port on the Mac.
No problem.
The printer is powered externally, not via the USB port, so a low-power USB port like the one on the keyboard is fine.
I have not tried running an external CD writer from the USB 1.1 port on the keyboard. For one, I think USB 1.1 may be a bit too slow for a fast CD writer; there may also be problems if you want to use that external writer to boot up the Mac from the disk. Maybe the USB 2.0 por on that keyboard works since it just seems to be an extension of the USB 2.0 port on the Mac.