Here's an idea. Why not add a "play through LAN" feature, so people could compete in their home networks as well? I'm not into game development, but i don't think this would be too difficult for Jussi.
Any supporters of my idea?
If you actually have local friends who play DSJ, simply invite them over with only their mouses instead of their whole pc systems. It'll be more realistic anyway since you will jump after each other instead of everyone at the same time.