Dodd Frank and Seller financing - BUYER side.

Given that the new Dodd-Frank regulations are absurdly long - I wanted to check and see if anyone is aware of seller financing limitations from the buyer side.  I know that if you are the seller, and want to seller finance more than 3 properties a year to owner occupants, you need to involve an originator.  But is there a limitation on the number of properties that you can BUY from sellers who are willing to do carry-back financing?

So let's say I have 10 leads willing to do seller carry-back sales this year, all at different rates (do they need to be tied to an index if each individual seller is only doing 1 sale?), with different amortization periods... Is there any legal or regulatory restriction on me closing all 10 deals? What about 100 deals?