Hello,
As suggested by Moriarty in the Modding section, can we get this option???
it would be nice to have a mechanic that allows for an item to have a property "ModifyXY: <integer value>". yes, negative numbers, too: perhaps the mind shield would increase Psi Power, but decrease Psi Skill while equipped? would make sense to me.
maybe there could even be two "modify" properties: "ModifyWhileInInventory" and "ModifyWhileEquipped" - a mind shield in the backpack might still help, but a sniper scope would only work if held in the other hand (or something like that)
This would also open the door for a whole lot of RPG-like stuff, which might be interesting for total conversion mods... Sword of +5 Strength, anyone? 
