To say nothing about right click - paste... unless they're doing the 1999 thing and blocking right click too (and if they are, hopefully it's with a 1999-tastic alert("Right click not allowed!");).
I would like to write some company that does this and say "control V doesn't work but I can paste the password in using the following methods.... this is a problem because it keeps me from using proper security for passwords on my clipboard. Can you please fix? PS Can I follow up with your PCI auditor directly?"