In the Bradley (M2A2 and M3A2, A3 has a whole different system I'm not very familiar with), the BC (Bradley Commander) can control most actions in the turret from his station. However, he only has a joystick to do so, not a full yoke like the gunner has - so it's slightly more difficult. He also has to reach way down to his left to control the weapon systems choice of ammo/ROF. In addition, he only has a single eyepiece to view what the gunner sees, and not dual-eye view. In short, shooting from the BC position is more difficult that from the gunners position, though BC's train for it.
As far as the systems being separate - yes, they are, but generally they are housed in the same place - otherwise bore-sighting would be more cumbersome.
Keep in mind, with the M2A3 and M1A2, the commanders have independent sights than the gunners - that way, while the gunner is identifying and engaging one target, the Commander is identifying the next target. Once the 1st target is killed, some mechanism is used (a button, I believe, but I've never seen it) that automatically swings the turret onto the new target for the gunner to engage, while the commander starts to scan elsewhere for a new target. This significantly ups the lethality of the weapons systems.
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