So how about extending the depth of the casting queue?

[Wendigo]

I am perfectly happy with the spell AI, its choices (BoW aside) are not worse than those of the average Dominions player.

A longer script would only result in increased MM.
We are all playing under the same conditions after all: if you have 5 spell choices, so does your opponent.

If you are familiar with the AI's targetting scheme, and careful with battlefield placement & research priorities you will get much more out of the spell AI that someone who doesn't.