I don't want such deep customization that you can make the village people. But customizing your soldier into different (or unlockable) uniforms, masks, helmets, gloves, boots, and things of that sort would be pretty neat.
Whatever works honestly.
Either way i will be happy with or without.
Not that I'd be excited for some 12 year old kid to shout in my ear how cool his character looks.
Just gives me the advantage of free head shots while everyone admires each others clothing and what not...
Whatever floats your boat.