[fprint] fprintd - timeout and max_tries option?

[emak]

Hi

I wanted to enter whether the password or use the fprint-reader. As the
fprint-reader is not alwas faster (e.g. remote login / close laptop lid
in docking station) I set this default order in my /etc/pam.d/system-auth:
auth sufficient pam_unix.so try_first_pass nullok
auth required pam_fprintd.so
...

I then realized, that gnome-keyring get's not succesfully unlocked if
"pam_unix.so" is only set to "sufficient" instead of "required". So I
switched the order to:
auth sufficient pam_fprintd.so
auth required pam_unix.so try_first_pass nullok
...

That would be okay for me if I could set the timeout / max_tries lower,
but somehow this doesn't work. I am using following config in my
/etc/pam.d/system-auth now, which doesn't seem to work:
auth sufficient pam_fprintd.so max_tries=2 timeout=3
auth required pam_unix.so try_first_pass nullok
...

I could not find anything on your website nor in the delivered docu on
how to change/use those parameters. Your advice would greatly be
appreciated.

Thanks
/Emanuel