Yes. It's interesting feature. We will add more DNS related features in future. The next thing will be DDNS or dynamic domain service. When you install NxUpdate on a system it will work as a dynamic host updater. And I am thinking of releasing a script version of NxUpdate. This means you can run it on a Linux system. I don't know how much it would be useful for ordinary users. But we are working on it. And for NxCloud users they will be able to build DynDNS like service. So it will be like a combination of OpenDNS and DynDNS.
About your massive upload, do you mean that you have a big BIND zone file? How many hosts do you have? It's supposed to read a bind zone file directly. You can create a zone file on 'DNS > Zone File' and edit it to upload your zone file.