Getting Castle to publish the style guide on the web sounds like a really excellent idea! I'm sure it would be in their best interests to make it as widely available as possible.
However, I do at least now have my own copy (thanks CJE ).
Moving between fields in ThumbCat is a very minor thing in such an excellent app: I would have contacted you about it directly otherwise. I do find the program very useful, so thanks for your work on it