Yes.
Once a port is part of a bridge It doesn’t really “exist” anymore, it Ioses some of its dignity and so adding ether2 to either LAN or WAN has little effect (actually none).
Same goes for ether1 the actual interface is either the pppoe one or the vlan one.
And while we are at it, you might find interesting Rules #1 and #2 here:
http://forum.mikrotik.com/t/the-twelve-rules-of-mikrotik-club/182164/1