Also, note that Emacs 24.4 (currently unreleased) will have improved full screen support and better color support (same effect as "brew install emacs --srgb"). I've been using the Emacs head (from a month ago) and it's been very stable for me.

For sane trackpad scrolling in vanilla Emacs I use this:

    '(mouse-wheel-scroll-amount (quote (0.01)))