It's very easy to extend an existing context menu or even create a new type for your own elements. To extend a context menu, just add your callback function for the menu type. To extend the task context menu, add the following line to your init.php file:

TodoyuContextMenuManager::addFunction('Task', 'MyClass::getMyCustomContextItems');

The easiest way is to have a look at the existing callback functions and copy some of their functionality. You'll get the task ID and the current list of menu items as parameters in your function. So you can add, modify or remove menu items depending on the context element and the users permissions.

With more than 200 pages this book will be a very nice tool for users to get used to todoyu and to get the most efficient way to work with it. There are a lot of tipps and tricks included from our snowflake-know-how which we gained in the last 5 years with the work within todoyu. Also the experience from our clients and freelancers is in there. todoyu users will have the possibility to work with real examples and use-cases in their installation mentioned in the book. But there's also an Admin section and a Developer section, which makes this book valuable for everyone who wants to work with todoyu. The book will be in german and the price will be less than 20.00 euros, pre-orders available here:

http://www.amazon.de/Projekt--Taskmanagement-mit-todoyu-offizielle/dp/3941841289/ref=sr_1_1?ie=UTF8&qid=1299774205&sr=8-1