I mainly use kwavecontrol (in BT5) as it's the least bothersome way I found to display the wifi link quality and it doesn't appear to use much CPU.
It's not in Kali, and this is probably because it uses qt3. I don't know anything about qt, but I read somewhere that qt3 and qt4 aren't compatible so that might be the problem.
Code:
checking for Qt... configure: error: Qt (>= Qt 3.0) (headers and libraries) not found. Please check your installation!
So now I'm looking at either compiling qt3 (who knows what old dependencies will crop up there) or?