quality reporting somewhat reversed

Hi all. I recently got myself an AR5212-based
card, and consequently wanted to see how well it performed with regard to the
signal/noise ratio, as well as some other things. After installing
Madwifi-0.9.3, getting Yenta working, and being able to use the card eventually,
I was pretty quick to notice that link reporting seems to be somewhat reversed.
Instead of a long-winded explanation, here is an example:
root@lappie:~# iwconfig ath0
ath0 IEEE 802.11g ESSID:"default" Nickname:""
Mode:Managed Frequency:2.412 GHz Access Point: 00:13:46:1F:57:B2
Bit Rate:48 Mb/s Tx-Power:17 dBm Sensitivity=0/3
Retry:off RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=54/94 Signal level=-38 dBm Noise level=-92 dBm
...

First off, shouldn't the upper end of 'link quality' be 100, instead of 94?
Also, I find that as my signal gets better, the quality number will actually
drop i.e., 45/94. And when I try and associate to some AP or other and I'm out
of range, link quality jumps to something like 127/94. Is this some sort of
Madwifi/wireless extensions/wireless-tools bug, or is this behavior considered
normal? For the time being, I find I can rely on the actual signal/noise ratio
(measured in DBm) to be accurate. The system I am running all this one is an LFS
system I built for this laptop. Output from iwconfig --version is below:
iwconfig Wireless-Tools version 28
Compatible with Wireless Extension v11 to v20.

Kernel Currently compiled with Wireless Extension v21.

ath0 Recommend Wireless Extension v13 or later,
Currently compiled with Wireless Extension v21.

Hmm...Upgrade wireless-tools to version Pre-29 perhaps? I'm currently running
kernel 2.6.19.2. So should I try upgrading to PRE29, or is there some other fix
that I am not aware of? Thanks!