Seriously? Someone told me that you need to hold Shift =/The last two posts were so unneccessary.
A.) There is no need to hold the Shift key to enter negative values. It is only when you are trying to get past hardcoded limits that that is necessary. Also... use of the shift key by people who don't understand why there are hardcoded limits in the game, is likely to cause crashes. (Like when a chain lighning is set to 50 bounces)
B.) The only thing he needed to do was explained really simply in the first post.