I set one up yesterday and scoured the manual looking for something like that. Never did find anything.
The other reason that makes me doubt it is that the Airport Admin Utility software is available in Mac and Windows flavors.
I just finished setting up my airport express. After being used to configuring non-apple wireless routers, I was wondering: other than directly using the Airport Admin utility, is there another way to configure the router? With my old linksys I just typed in 192.168.1.1 and I know some other routers use 192.168.0.1; can the airport express be configured this way as well?