Feature request for Universe 2.0 (idea)

• Customizable laws of physics (imagine Tuesday being Newtonian physics day, and Wednesday Aristotelian physics day)
• Unlimited undo, backups
• Neat aliens (not rocks on Mars)
• Forgiving thermodynamics (why can't I exceed 5000 degrees C when focussing the sun with a parabolic mirror?)
• Lower speed of light.
• Time travel (if we fix this, we might manage to make the customer's deadline!)

The following are showstopper bugs:

• Documentation!
• Incomprehensible error message when dividing by 0 (division should either work for all arguments or be removed from the system; currently it just confuses the users).
• Premature termination.
• Perpetuum mobile still doesn't work.
• Primitive beliefs of dominant lifeforms.
• Continuum hypothesis is independent of just about anything.
• Doesn't work in the debugger.
• Ugly color scheme.

I could go on, but this should be enough to get people working...