mod all and negative values

Hey frist pots.

Like all suggestions this has been here before but I'll say it again. I want everything to be modded. Both positive and negative. I like how various buildings can have stuff like culture or pollution but some of those can't change very well. Production I don't think can be negative. Happyness can't either. Many of them don't have the precision needed either. Production has 4 for 100%. What if I only want a small help.
May of the values are can't be changed leader chance is always 1/16 or 1/12. And promotion is 1/1, 1/2, 1/4, 1/8, or 1/16.

actually, you can mod negative happiness. you add unhappy faces. IIRC there is a building in the mesoamerican scenario that does just that