Harmony - Troop Symmetry

I agree, but there's nothing that can be done about it now.

It is possible, but it would require some workarounds, and scripts would be needed – I want to avoid them because: 1) I don't know how to use them; 2) a mod that uses scripts would require processing each map before the game (you would need to enable scripts for the map), which is an unnecessary step – although there is a program that comes with the NHF mod that simplifies the process.
The idea would be to present the magic school and the suppression of that school as two opposing elemental magic skills (e.g., chaos is transformed into fire magic, and the suppression of chaos into water magic), with fire magic spells being learned in the guild, and water magic spells being given as perks and placed in the SPECIAL magic school.
Well, as I said, it would require a lot of workarounds. Plus, it would be incompatible with many user-created maps (primarily single-player scenarios, not multiplayer ones).