I've wrote a little Applescript to set this bandwith limitation at every start of the Mac (these settings arent' kept when the Mac is shut down)
Feel free to download it there
http://idisk.mac.com/remyleroy/Publi...imitation.scpt

Just edit the script using AppleScript Editor and change
type_your_Airport_base_station_IP by the correct IP address of your Aiport Base Station (mine is 10.0.1.1)
and
write here your admin password by your Admin password (between quotes)

Save this script as an application and launch it after every start of the Mac

Note that this script only reproduces what is explained in this thread. I'm not a specialist of these Terminal and Unix settings..... but if you've tested the fix and you noticed that it works for you, this script will allow you to automate it instead of typing these 2 command lines in the Terminal at every start.

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Sorry the URL to downlaod the script is
http://idisk.mac.com/remyleroy/Public/ipfw_AirportPrinting_bandwidth_limitation.scpt

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