A two part question

Can your model releases be linked on any of the sites?  I could have sworn that Dreamstime does this, but I can't find a way to link the same model together to her other shoots.  Wouldn't buyers like to "see more images of this model", not just from the one shoot associated with this release?

I think it was Ron Chapple who puts a unique model id# in the keyword  data, this seems so logical, but do the agencies not frown upon this?  Wouldn't it be convenient if we could tell a buyer or the model that they can search their number and all of their photos will pop up?

Any tips on managing releases on my end?  I have the least sophisticated method right now - in a binder sorted by last name, but wonder in a few years if I will even remember who some of these people are.