First of all, i would like to congratulate you all on the fine piece of software you created.
I would like to know if there are any plans on creating a DNS cluster option in ISPconfig any time soon. I know you have the option to add a slave zone but this would have to be done manually for every domain and you can imagine how unpractical that might be if you plan on having say....300 domains hosted on one server ( and 17-20 servers in total ). An option to propagate a zone created on one server to every other nameserver you have would be invaluable to any webhosting firm.
On the other hand, if this option already exists and I'm not aware of it, then i apologize