There is a lot to know but I feel this is a great plugin. A tutorial is probally needed. It may of saved you some time while I was learning the essentials of the plugin. There will be people that will use this plugin as is and then there will be people who will want to get creative. A text document in the appropriate folders with proper instructions will assist them with the creative aspects.
A real hidden option with no arrows would be great. I would really like to see an option for costs to be hidden after a node is activated or at least an option to alter their colors afterwards. I started a thread for suggestions. I'm not sure how many people have downloaded the plugin but I can't be the only one with questions.
Thanks for everything. Feel free to contact me anytime. Good luck