The thing that fascinates me the most about all the "old School" chicken keeping is that what was done was for the most part based on science, but that the old school folks probably didn't know how/why it worked but that it did. Obviously the kerosene works, not that I will use it in the near future, but there may come a time when it might be called for and it's good to know. All the preventative things we do, well we can't see inside the chicken until it is dead, for the most part, and I'm not a poop watcher either. I also like to know what I have on hand, in the house this very minute, that may also work. It's all good, and the beauty is that not one size fits all and there's plenty of room for what ever works for your individual situation.
Aoxa: looks like you have done a great job on Jane Doe Chicken's feet. Frozen feet are not something I would have even thought about. And yes, the dead tissue would be the problem, but she looks like there is good healthy tissue coming in there. You were 'lucky' to catch it as fast as you did.