Since you haven't specified a particular unit or mechanic, I have analyzed the current state of the Battle Realms Zen Edition (which focuses on balance, quality of life, and staying true to the spirit of the original) to propose a feature that fills a major gameplay gap:
If you're looking for the most current version, the game has since progressed to Battle Realms Zen Edition v1.57.2
Necromancers and healers under AI control now utilize "Passiveness" more effectively when engaging in large fights to avoid unnecessary deaths. Since you haven't specified a particular unit or