[I hope it's okay for me to respond a little bit here, even though this isn't really a discussion thread]
The issue of optional sidequests' optionality being mostly pointless is interesting -- I would think the crux of the issue is that in most games, there's zero opportunity cost for taking on a sidequest. If there is, it's because it's one of the central, well-thought-out elements of a game. But even a little opportunity cost, like time lost, or losing the chance to recruit a character, or angering one group because you were seen assisting another, would be nice in games that have those optional sidequests, so it's actually a practical choice rather than a decision between experiencing more content or missing out on it.
[Note: I'm not here to demand that you do this, Craig. By the very fact that this thread is about stretch goals, I can tell you're, well, stretched. Although, should you happen to choose to have sidequests, I feel that a legitimate opportunity cost to undertaking them would be yet another interesting element in this already unconventionally awesome game.]