The small UI improvement would be a scope view. Scope view shows you the unobscured view of the target within a small scope window. In this window you can aim for any specific body part ala fallout.

Definetly check out Combat Mission ,it has revolutionized turnbase strategy war games, with its true 3d enviroments, relaistic combat simluations, and simultanous turn base.

Good Luck

-ddn