Paul,
i hope all this does not end in a disadvantage for me (this season). you know that i NEVER liked this sleeper-thing but this season i was kind of bored with my team and so i treid to get a kick out of trading TONS of picks in order to get
world trading champion 
Anyway:
Remember that i had to pay for all those picks and i lost a lot of players, some of them quite good, in order to take a risk. I still could end up with
no sleeper and everyone would laugh at me.
BUT: IF i get a sleeper or two or three i expect the ratings to be fair.
Regarding your text in the trades-file "...limit the picks per round...": i rathe rwould encourage you to drill down the draft to just 6 rounds or so ==> that would make both the later rounds and the FA-signings more important as teams would have to cover losses from retirements.... just an idea.....