@Smurf
It could be a greater challenge to defeat enemies without killing them, as already mentioned, and you'd need to choose unconventional tactics on the battlefield. The gameplay would be different.
Moreover, i like the idea of having alternative ways of winning a mission than just killing the enemies.
Surrendered enemies could become civilians, as far as i know its already possible to arrest civilians and to transport them.
@ChrisB
Thanks for your tips. Why is it problematic to use these features in A3, are the mods not ported to A3 yet or is it because the AI is different in A3?