I have 2 week old bantam chicks and I put a long branch in the brooder with them and they took to it right away. Some parts of the branch are floor level and other sections are 8 inches high. In just 1 week they are pros flying up and down. At first they walked up to the top the long way, but in 2 days they were jumping/flying on it and being really good at it. I switch it around, turn it upside down and have added a 8 inch high stump. They seem to love sitting on that too and I have had no problem with them trying to sit on the feeder and water bottle.
Even though they play on the branch and stump and sit there a lot, they still sleep on the floor, so I guess they are not actually roosting. But they are having fun.