For something like the RE5 demo, it should be something like this:
Player 1: DS3. Able to shoot and move freely at the same time.
Player 2: Motion controller. Move together with P1 automatically (No movement control). Handles light source or sidearms. The light source may start with a flickering candle, to unreliable torch light, to flaming torch that can double as a weapon (or even light a dynamite for throwing -- with 2 motion controllers).
I'd prefer simply:
DS3: strafe + look (camera)
MC: aim (pointer) and shoot
of course "simultaneous move and shoot" tech is too complex for RE5.