It would be nice to have MAC-VLAN feature in Mikrotik.
Description is for example here:
http://cateee.net/lkddb/web-lkddb/MACVLAN.html
http://jim.studt.net/depository/index.php/notes-on-linux-s-macvlan-module
I use this in Linux routers for example to grab more public IP adresses from ISP if they are available only by DHCP.
Pavel