The multiGateway sounds like a game changer!
It's not a game changer until developer post clear explanation on how this thing works.
Is it trustless? If not, where are bitcoin private keys stored? Is it centralized server? Where is the guarantee that money will not be stolen from that server?
Until the developer posts clear answers to this question with proof that centralized server is safe and is close to trustless, no one should use it --- if they don't want lose their money, that is.
All of gateway need be trusted include NXT multigateway, we have 2 GWservers(have no internet address) and will be more to runing GWservice. They are checking the NAS blockchain & AE like normal node around the clock, but its behind NAS blockchain that hacker cant find the server without internet address. Deposit: BTC->NASGateway(transfer btc to hot wallet & register AE & transaction log to NAS blockchain)->nBTC->exchange||more apps, withdraw are the same way. And this is another way to exchange the BTC/NXT/NAS to AE and with more apps in WinNAS. Its in the close test now, we will publish all of the source @ sep finally.