Negative Stats

I can use Item Damage Bonus and Item Life Bonus abilities to add damage and life to units, but is there anyway to remove damage and life? The data field won't allow for negative values.

have you tried changing the preference allow negative real values?

Yup

id also like to know this,
the thing is, the values for such abilities dont contain real values, the have integer values, which "allow negative reals" doesn't affect. Although it seems that if you editted them outside the map it should allow it, assuming that simple edits like that don't crash the game :P

Simply Shift+DoubleClic on the field and it will allow negative integer values.