Thanks for that.
Force feedback is one of the project for the Google Summer of Code,
so there's no sense for me to take it, although I liked the idea.
But my supervisor came out with the idea to implement some ray tracing functionality.
I decided that I should focus on:
Graphics - first priority, and Audio - second priority.
I really liked the idea about ray tracing, and presented the idea to other lecturer in my college, who liked it as well, and I would like to hear some oppinions about it, and also other ideas on audio and graphics.