I followed that thread and did what was said. This is what I did: comment out all references (2, actually), to pam_gnome_keyring.so in /etc/pam.d/kdm. Upon rebooting and re-logging in, I was asked for the password to what I presume to be the gnome-pam-keyring (instead of having to enter the secret passphrase for the router). This is how it also behaves under gnome (which I don't use and no longer have installed on my desktop computer, only the laptop for now). This is what I had wanted to achieve. Problem solved. Thanks.
