I'd prefer to put bonuses that have more relation with the project. Thoses parodies are cool, but not enough "Jedi Knight-related", I think...
This project sounds cool, I would help you but I won't be going home to my computer with my saved games until december.
You could include the original darkforces cut scenes on the disc as an extra, gotta love the crappy computer animation
maybe add this trailer, but it is low resolution: trailer