Having a separate place to put things related to casting would be beneficial when trying to research previous information. It would group related information in one area.
As it was pointed out, this is a type of casting that does not fit traditional casting forums, and is directly relevant to pen making so this would be an acceptable place to have it.
There is so much more to casting than what is laid out in the tutorials. The tutorials are great for a beginner, but the information only scratches the surface. I believe a separate forum would encourage the sharing of this information more, and would allow more exposure to this aspect of pen turning.