I think something that'd could be considered is something like a Spell -> Creature mapping.
You know, let's say your deck has RE and Steel Golems, then you can give some kind of priority whether you want it to use it as CC or to power your golems. (this might go in the direction of your aggressivness idea?)
Another example with adrenaline: if your deck has RoL, Rustlers and Frogs you can make a priority list on which creature to use Adrenaline first or even not use it at all.
Or if you have a OTK, you say, wait for these cards and then play them on creature x.
Or an option: do not buff a Dune Scorpion more than once.
I think the main difference between your idea and mine is that you tell the AI more explicitly how to play your deck instead of the "style" it has to be played. Of course mine are just a few examples and the possibilities might need to be more specified but I thought I'd give another idea
