I didn't try it with the WLAN card installed, but turning the radio on/off in the WWAN software didn't seem to do anything to pin 20. I didn't mess around with it very much, though.
For the WWAN software, I was using the application on this page under Communication for the HSPA card.
Drivers & Downloads
Also I'm running Win 7. All the Mini 9 software appears to be Win XP only, but the WWAN software seemed to install fine. Don't know if it was something I did to get the QCom card working, or if it would have worked anyway. Just nice that it did end up working fine.
Unfortunately the Broadcom HD decoder card didn't show up today, so I'll have to wait until I get back from a trip in about a week to install and test it out. Shouldn't have any problems getting it to work, though, the WiFi card was the only uncertain thing.