I'm pretty sure this has been suggested before. I haven't been here that long and I remember TFO or someone thundering on and on from above as to why it wouldn't work. Something about how lack set the database up in the beginning and not having forethought, and how it requires copious amounts of time to do so etc.
I agree, cool feature can't be that bad to link games together etc. Another site I play on each game u play can have different name. It's become detective work to find who is who, and slip in a new alias to play anonymously etc.