Single Password Auth for NoCatSplash

Maybe slightly greedy asking two questions in a row, but lets give it a go.

I'm trying to set up NoCatSplash for a local cofreeshop. I'm 
installing it on a WRT54G router. Currently the authorisation scheme 
is set to Open (which as far as I can gather is the only one 
available). This just requires clicking a button. At the other end of 
the scale it is possible to get NoCat to authenticate to a Radius 
server, where each user has an account and a password.

It seems to me that it would be a good idea if there was some middle 
ground: Basically if access was controled by a single, global 
password that the coffeeshop staff could set  every day/week, so that 
only customers which had the password could connect. This would 
ensure that the people using the AP were at least obliged to come 
into the shop. I'm guessing this probably wouldn't be too hard to 
code into the script, and if it was held as a configuration variable, 
then it could be altered fairly easily.

Any plans for this to happen? Or is someone smart enough to hack away 
at the script. If it was in PERL / PHP , I might have a go, but this 
one has been compiled, so I'm pretty much in the dark.

Jim