One Nice Little Thing I like About Leopard - Sloppy Focus for Scrolling
I switched from Linux(Gentoo, to be specific) to OSX a few years ago, and one of the feature I missed the most is the ability to set mouse focus mode to sloppy focus, as OSX up to 10.4 supported only sticky focus.
For those who have no idea what I’m talking about, sticky focus means that in order to focus a window with the mouse, the user would have to click somewhere on that window, whereas sloppy focus means that the user would have to simply move the mouse over some visible part of that window. In sloppy focus mode, the user can perform tasks such type text, scroll, etc. to a window that’s covered up partially by other windows.
In Leopard, the mouse supports limited sloppy focus for scrolling, meaning the user can scroll the content of a window without having to click on it first. I found this improvement very useful for me in situations like when all I’m interested in is the left half of the browse window, I can now scroll and read its content without having to bring the entire browser window to the front or having to resize the browser window.