[Arryn]

My suggestion for externalizing the spells-permitted list is just that, a list. Only one option per spell: 0 or 1, no-cast/castable. of course, if the devs want, the options per spell could be expanded to allow much more variety, but a simple yes/no is all that's really needed to "fix" the AI spellcasting silliness. Anything more is just icing on the cake.

I do not advocate external script lists, though I do think they'd be pretty cool.