OpenIndiana Distribution

My ISP has now recently starting providing IPv6, after initially configuring IPv6 on some laptops and VMs.
I started looking at enabling IPv6 on OpenIndiana Hipster.

In order to add an IPv6 address, you must enable autoconfiguration first as per https://docs.oracle.com/cd/E23824_01/html/821-1453/ipv6-config-tasks-64.html

1. ipadm create-addr -T addconf e1000g1/v6

when I try to add a static address as per document

1. ipadm create-addr -T static 2000:A:B:C:D:E:F:G/64 e1000g1/v6
   ipadm: Invalid arguments
   usage: create-addr [-t] -T static [-d] -a{local|remote}=addr[/prefixlen]
   <addrobj>
   create-addr [-t] -T dhcp [-w <seconds> | forever] <addrobj>
   create-addr [-t] -T addrconf [-i interface-id]
   [-p {stateful|stateless}={yes|no}] <addrobj>

if I change the addrobj then the address is added, eg

1. ipadm create-addr -T static 2000:A:B:C:D:E:F:G/64 e1000g1/v6a

The document indicates to turn off IPv6 Address Autoconfiguration you need to include in /etc/inet/ndpd.conf the following definition

e1000g1 StatelessAddrConf false

When I check the Address Information

1. ipadm show-addr o all
   ADDROBJ TYPE STATE CURRENT PERSISTENT ADDR
   lo0/v4 static ok U--- --- 127.0.0.1/8
   e1000g1/v4 static ok U---- U-- A.B.C.D/N
   lo0/v6 static ok U---- --- ::1/128
   e1000g1/v6 addrconf ok U---- U-- fe80::::::::/10
   e1000g1/v6a static ok U---- U-- 2000::::::/64
   e1000g1/v6 addrconf ok U---- --- 2000::::::/64

I would like to able to remove the auto-configured Global address, I modified the ndpd.conf so that included

e1000g1 StatelessAddrConf false
e1000g1/v6 StatelessAddrConf false

I have tried them singly and together in different order but the autoconfigured Global Address keeps appearing.

The autoconfigured global address would initially disappear after performing a "pkill -HUP in.ndpd" but it always returns.

It should be possible to assign an IPv6 address statically without enabling autoconfiguration.

IPv6 configuration should be as easy that provided for example on Linuxmint.
Being able to set
a) static Link Local Address
b) DHCP Address only
c) DHCP Options only
d) Automatic (via Router Advertisements/DHCPv6)
e) manual