Hello,
should be possible as i see it. The Main.pak [1] holds a lot of scripts dealing with spell behavior, and script language is pretty basic. You can find the icons in the resource manager if i'm not mistaken. But you would have to do some pioneer work since this has not been explored yet ;D

[1] http://www.larian.com/forums/ubbthreads.php?ubb=showflat&Number=505777#Post505777