Recently I've moved from PS/2 keyboard to USB and thought it was a good decision, until I read from some forums that USB keyboards supports better features than PS/2 keyboards.
Unfortunately, I already had thrown my old keyboard away.
Does converting a USB keyboard to PS/2 makes it NKRO?
It will limit it to a 6KRO. Which is fine, unless you like to use your face as well . Don't confuse NKRO with anti-ghosting though, that's a different type of technology. So there's no point in getting an adapter unless you dont have a usb connection for the keyboard, because you will get 6KRO through a usb port anyway.