Additional functionality I want to see is the ability to use upgrade coupons on the kiosks. And to be able to change trains.
I'm not so bothered by entering my credit card. I think that's an option for airlines, too.
Putting kiosks by entrances just seems like a way to clog the entrances.
With a limited number of kiosks, putting more info on them so that passengers are encouraged to spend more time on them will just frustrate alot of repeat riders (and in the NEC, I would believe that way more than 50% of riders are commuters)