I can't say for certain how it will help Windows, but it can't hurt. The key way to test this would be to turn this on, enter a fake domain, and try it out. I checked the defaults on Windows 7, and it should work assuming the router hands it out as "Connection-specific DNS Suffix" as reported by "ipconfig /all" run in a command window.

If you want to adhere to the specs for the fake domain, use something that ends in .local instead of .com/.net. For example, gbeer.local.

The only concern I have now reading back is this part:
Quote:
Note, however, if the AP's settings specify "DHCP (Dynamic)" Address, and the router's DHCP server assigns a domain name to the AP, that domain name will override any name you enter here.

That may mean the router will not hand out your fake domain if your ISP hands out a real one. Mine for example sets the Connection-specific DNS Suffix to "oc.cox.net".