Theoretically the answer to all your questions is yes. Simply said (but not false AFAIK, I work in the field): stimulate the correct group of brain cells and yo

Theoretically the answer to all your questions is yes. Simply said (but not false AFAIK, I work in the field): stimulate the correct group of brain cells and you can achieve pretty much anything you want; after all everything you do/feel/think is done by having groups of cells activated and communicating with each other somehow. The main problem is finding those groups of cells.. There is an incredible amount of research left to do on how to do it because what we know about the brain is still much less than what we do not know, and the implementation (hardware etc) is also complicated on all levels you van imagine.