there is a bug in the current ra config mode where it does not set the right mode. That is still open for fixing.
The IAID will have to be saved into the config.xml to make sure it persists, not sure why it needs another file unless the clients needs to have it that way.
Also, I will likely pull the wide client and move to the ISC dhcp6 client at some point. Atleast before 2.1 is released.
That client supports configuring a "pretty" ipv6 address on a prefix delegated. e.g. <prefix>::1
It's not that dhcp6 server is not a priority, but I'd rather get cascading prefix delegation working.</prefix>