Lighttpd - disable ipv6 and bind to router ip

Turris Omnia - rtrom01
Turris OS 3.9.6
Kernel 4.4.119-082ea0f4a4e204b99821bedcb349ed54-0
Firmware OpenWrt omnia 15.05 r47055 / LuCI 49c3edd5861fd032fa8379ceda525c27a908a114 branch (git-17.212.24321-49c3edd)
lighttpd 1.4.47-1

Not sure what the purpose is of having lighttpd bound/listening to/on the wildcard address, perferably it should only listen on the router ip. Also wanted ipv6 off which however is set as default in

  $SERVER["socket"] == "[::]:80" {  }

For neither LuCI or Foris offering an easy acces to (change) the lighttpd settings. These changes then achieved via ssh to get lighttpd bound to the router ip and ipv4 only, perhaps not elegant and leaving the question of what happens when lighttpd gets an update.

   # $SERVER["socket"] == "[::]:80" {  }

 $SERVER["socket"] == "router.lan.ip:443" {
# $SERVER["socket"] == "[::]:443" {
# 	ssl.engine  = "enable"
# 	ssl.pemfile = "/etc/lighttpd-self-signed.pem"
# }

server.bind = "router.lan.ip"
server.port = 80