May be true, may be not, but saw in a thread earlier that Purina feed created less smelly poo than Dumor feed (which I use). A few others on that thread agreed, but who knows. I know in other animals, feed makes a difference - whether it will make a noticeable one, who knows?
As for scalding, I just processed a roo with my mother-in-law a month or so ago, and because I wanted the feathers, I wouldn't let her scald it. After we plucked it, she said she would never scald another chicken again - it was easier to dry plucked, and it didn't stink. My cousin dry plucked all of hers as well, which is where I got the idea I could get away with it. I have no basis for comparison though, just sharing my experience as well as my MIL's input.
Hopefully it will be worth it in the end!