Kaiser has a new 31.1 pre-release that apparently fixes a trackpad scrolling bug. It's SERIOUSLY faster than the 31RC. You can find the link to it at his blog, tenfourfox.blogspot.com in his latest post. It's intended for 7450 machines, late models with trackpad scrolling, but I'm using it on an A1013 with iScroll 2 and it works just fine. Take a look.