In RL it's extremely obvious when someone is looking behind/around. We are on the realism board, so the only suggestion that makes sense is disabling it.
But of course then we'll have less trololo last second pointy stick pranks, and good cav will do better. Atm, this doesn't really separate the good cav from the bad, as there's no way to tell for certain whether someone is ~ing or not. It's all guesswork which makes it quite a stupid game mechanic.
It also offers the possibility of running forward at max speed while looking behind, which shouldn't be possible either.