For the spraddled chick, take some medical tape (like you would use to tape a guaze pad to someone) and tape the legs together in the proper position. I've had good luck fixing spraddle legs if fixed in the first couple of days. Leave the hobble on for 2-3 days and then check the chick. It usually falls off on it's own by 3 days, so I don't normally have to remove it. Temperature issues and stuck chicks can have leg issues. My last one was a chick that was stuck in the egg - it had zipped but couldn't turn to get all the way out. Be very careful with hobbled chicks, they can drown in the waterer more easily. Most run around just fine though.
Here's more info, if you need it:
https://sites.google.com/a/larsencreek.com/chicken-orthopedics/leg-braces
The only leg issue I have not been able to fix, and will cull for, is a slipped hock tendon. I've tried to fix them, and I always end up putting the chick down.
Definitley no foam inserts and they are not listed on the list of what is in the box.. I might need to order some for the next hatch.