Can I disable horizontal scrolling? Most of my computer use is with Word for Mac 2004, MacBook Pro, glass trackpad. I use two-finger scrolling all the time, but I'm troubled by accidental horizontal scrolling when I mean to scroll vertically. I've tried to disable horizontal scrolling in Terminal with the command defaults write -g com.apple.trackpad.scrollBehavior 1 After restart, the relevant value is set to 1, but the behavior of the trackpad is unchanged. Any other ideas?