One possible workaround that I thought of is to return the redirect URL in a JSON return similar to my upload submit. Then in the JavaScript I could simply redirect. I think this may work, but I'm not sure how to get my success/warning/error messages. Can you post a flash message/variable from JavaScript? Is there a JavaScript equivalent to using ->with(...)?

JS (in complete method)

...
 			case "post":
					window.location.replace(data.url);
	 				break;
	 		}

Controller

} elseif(Input::get('post')) {
				$response = array(
					'type' => 'post',
					'url' => URL::to('/'),
					'success' => true);

	    		return Response::json($response);
...