Read the "teensyduino" section of the teensy site - that has the instructions for getting the IDE extensions you need installed.
I'm will aware of the instructions for using the Teensy with the Arduino IDE. I just said that I read the section "How Does Teensy 2.0 Compare With Arduino?" and that is found in the section you pointed out.
I suspect you can't just call it a leonardo because the boot loader is probably not the same as the leonardo.
The Uno and the LilyPad have different bootloaders, however, they can both use the "Serial" library, make calls to delay(), and do "analogWrite()". These are all functions that are included as part of the Arduino environment. If you have a Leonardo, functions like "Mouse.click()" and "Keyboard.press()" are also include even though they are not available to the Uno. I wanted to know if the Leonardo functions, for lack of a better term, where natively available to the Teensy 2.0.