Multiple gateways, one login?

On our community wireless network mesh, we have several nodes online 
now, and routing occurs between each one. I've tried just using one 
nocat gateway at the source of the internet, but when someone more than 
1 hop away tries to log in, they get redirected to nocat and they hit 
the button, but it doesn't let them through. If you look at the status 
page, it shows their MAC address as being blank. So that's problem #1.

In the future, various nodes would like to run their own NoCat gateway 
to have a custom greeting for their users that isn't so generic. If each 
node ran their own NoCat gateway, would a user have to log in to every 
NoCat between them and the internet? If so, is there a way to "notify" 
all the other gateways to let them through so they only have to log in 
once?

Thanks,
Drew