Sorry you're having issues with your game streaming. So the issue with the buffer would be you wouldn't be real time streaming, or you could potentially pause your game every 5 seconds which I don't think would be a good experience for anyone. None the less,
if you would like a new feature added to Xbox please go to the following site. Microsoft regularly polls everyone's ideas, and has done a good job of focusing on what the gamer wants. If other people like your idea they can up-vote it for higher visibility.