I am not a dealer and I have already had three registry sets submitted:
T56 Emblem Series
http://www.psacard.com/psasetregistr...te.aspx?c=6234
T51 Murad College Series Basic Set (All 150 colleges)
T51 Murad College Series Master Set (All 225 cards including variations)
http://www.psacard.com/psasetregistry/setrequests.html
These should get published soon.
Now, I'm a member of one of the fraternal orgs in the T56 series, so I could have changed the weights rather than left them all at 1.
Same with the T51 Master Set; I think I set them all to 1, but the Number on front variations are rarer than the 1-25 cards without them. Maybe whoever decides to compete against me with their T51 set will suggest that change, and I'll accept it.
They have an entire message board over there to discuss registry sets, so you could ask this over there and probably get a better answer from the people who made those requests.