wan-ip x.x.x.x lan-ip x.x.x.x
wan-net x.x.x.x lan-net x.x.x.x
wan-gateway x.x.x.x time-server x.x.x.x
wan-dns1 x.x.x.x ect.
wan-dns2 x.x.x.x ect.
Than a drop down menue on the place where you normal put you ip addresses.
In this way you can put the ip addresses on one place in the firewall/router and not on every rule if they have changed.
You already can do this with address lists.
http://wiki.mikrotik.com/wiki/Manual:IP/Firewall/Address_list
yes I use already, but only works with Firewall filter but not on the action to addresses, mangle and NAT facilities not with DNS, NTP, and other settings