Can't override function keys in kbdcontrol

[Pragm B]

Hello everyone,

I have problems overriding the functions keys of my keyboard in FreeBSD 9.1

The kbdcontrol utility can be used to define specific values for the
function keys. See here:
http://www.freebsd.org/cgi/man.cgi?query=atkbd&apropos=0&sektion=0&manpath=FreeBSD+9.1-RELEASE&arch=default&format=html

It is stated that the function keys can be overridden using
kbdcontrol -f # s

where '#' is a number from 1 to 96 and 's' is a string that will be outputted.

When '#' is between 65 and 96 (unassigned functions), this works.
However, this does not work for functions keys between 1 and 64!

Any insight is much appreciated :)

Cheers,
Pragmb