Hi,
As a Math teacher in a french school, I'm going to teach "computer science" next year (2 hours per week for pre "bacalaureat" pupils). I may use Processing as a development langage and environment and would be very interested in using a debugger.
The features you propose would completely cover my needs. As the machines we have in our classes are never the most powerful and up to date ... a basic but light-weight (maybe command line) debugging tool would be much more helpful than an even more powerful and user-friendly but too CPU and memory consuming one.
If you are interested by alpha or beta tester for you future debugger, feel free to contact me.
Pascal