dhcp vendor id

feature was introduced a while ago in v6.47 and it is also avail in v7beta8
in v7beta8 I am able to link an option-set to a vendor-id (what is obviously the main-purpose), but I cannot do that in v6.47 ( … our beloved production-release) ??
… dhcp is application-layer, nothing kernel relevant (imho) and I would love to see this feature in my production-devices ( for phones, AP’s, IoT-junk etc.)
.
so question: did someone just missed to link the CLI-command ? feature is working pretty in v7beta8 … whats wrong with v6.47.x ?



[admin@v6.47] /ip dhcp-server vendor-class-id> add                  # [admin@v7beta8] /ip/dhcp-server/vendor-class-id> add 
Creates new item with specified property values.                    # Creates new item with specified property values.
                                                                    # 
address-pool -- pool used for this vendor-class-id                  # address-pool -- pool used for this vendor-class-id
copy-from -- Item number                                            # copy-from -- Item number
disabled -- Defines whether item is ignored or used                 # disabled -- Defines whether item is ignored or used
name --                                                             # name -- 
server -- global or single server                                   # option-set -- 
vid -- contents of vendor-class-id as string or hex with 0x prefix  # server -- global or single server
                                                                    # vid -- contents of vendor-class-id as string or hex with 0x prefix