Hi, we have small language communication problems 
- Usb Lib
I will try the library on arduino 1.0 but I think you are happy using 1.0.1? Everything works okay for you?
- Debugger
Please "Register" on visualmicro.com. When you register include a request to join the debugger beta team. You will then be given more instructions for the debugger.
The are many documents on visualmicro.com about the debugger, there is a small wiki and also this overview
After the beta program ends, only registered beta testers will be given a free debugger license