I don't know about the ghost problem, but I like the car thing.
Should make the damage directional so that the roller is what kills the vehicle, and there is a chance for you to die.
I assume that each computer's WCIII has an install with a different CD key and is able to connect to bNet?
Are others on bNet able to join your game? Yes?
Assuming the port forwarding is correct, probably anti-virus firewalls on ailed PC.
Right. The variable you are manipulating in your for loop is set to 1 (or initial value) every time a unit starts channeling. So player 1 casts and completes half the spell, then player two casts, player 1 will continue a full 150% further than supposed to, and player 2 will finish in 50% of the...