I experienced a similar 'feature' with a wireless keyboard & mouse. Damn irritating if you want to get into the BIOS.
I put it down to the fact that the transceiver was USB connected and that USB doesn't really liven up until well after the PS2 ports in the boot process.
Fortunately the transeiver came with a USB - PS2 adapter. Using that solved the access to BIOS issue and keyboard mouse worked just as well. Don't know if you have that option ?
As for the CD & DVD drives - not sure on that one.