http://forum.mikrotik.com/t/feature-request-pppoe-option-82/38611/1
I have filled a long time feature request to implement Option 82 for PPPoE server and it confirmed by mikrotik staff . but no news yet . it is very useful .
the feature request located at http://wiki.mikrotik.com/wiki/MikroTik_RouterOS/Feature_Requests just search for “PPPoE Options just like DHCP Options” to find it .