I play BG2EE with SCS/Spell Revisions/Item Revisions and have done a lot of OCD weidu modding to fix errors and suit my tastes (like adding a unique animation for every different spell protection so I can tell what the hell's going on with enemy mages, etc.)
I've never touched the game engine though. Specifically I'm looking for a way to cosmetically change Mirror Image by applying a transparency effect (or maybe Blur) to the mirror images. When I have often have 2 mages running around with that spell up, I find it really clutters up the screen. Making the images 80%(?) transparent would clean things up.
Can you point me to a thread or link that would tell me how to even get started looking at the engine? Or alternatively, you may know if this is even a possibility.