Change wireless interface "sens" value how?

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I am trying to resolve some wireless issue with a laptop running F14,
and I need to change the "sens" (i.e. Sensitivity) value for the
wireless interface.

However when trying to run the following command as root it fails:

iwconfig wlan0 sens -65

gives output:
Error for wireless request "Set Sensitivity" (8B08) :
     SET failed on device wlan0 ; Operation not supported.

and yet the command "man iwconfig" gives for this section:
       sens   Set the sensitivity threshold. This define how sensitive is  the
              card  to  poor  operating conditions (low signal, interference).
              Positive values are assumed to be the  raw  value  used  by  the
              hardware or a percentage, negative values are assumed to be dBm.
              Depending on the hardware  implementation,  this  parameter  may
              control various functions.
              On modern cards, this parameter usually control handover/roaming
              threshold, the  lowest  signal  level  for  which  the  hardware
              remains  associated with the current Access Point. When the sigâ
              nal level goes below this threshold the card starts looking  for
              a  new/better  Access  Point.  Some  cards may use the number of
              missed beacons to trigger  this.  For  high  density  of  Access
              Points,  a higher threshold make sure the card is always associâ
              ated with the best AP, for low density of APs, a lower threshold
              minimise the number of failed handoffs.
              On  more  ancient card this parameter usually controls the defer
              threshold, the lowest signal level for which the  hardware  conâ
              siders the channel busy. Signal levels above this threshold make
              the hardware  inhibits  its  own  transmission  whereas  signals
              weaker  than this are ignored and the hardware is free to transâ
              mit. This is usually strongly linked to the  receive  threshold,
              the  lowest  signal level for which the hardware attempts packet
              reception. Proper setting of these thresholds prevent  the  card
              to  waste  time  on  background noise while still receiving weak
              transmissions. Modern designs seems to control those  thresholds
              automatically.
              Example :
                   iwconfig eth0 sens -80
                   iwconfig eth0 sens 2

So the command should work according to the man command section above.

Can someone tell me if there is some workaround for this or is this a bug?

I have already reported as https://bugzilla.redhat.com/show_bug.cgi?id=677008

-- 
mike c
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