Earlier quoted context omitted.
Citation? Sorry, but it's been in Ubuntu for ages, and that's what I use. As for the visual cues, it looks a lot like OS X. Currently focused windows has a highlighted top bar and pronounced shadows and is in front of other windows. As for where the keyboard and mouse events... keyboarrd goes to focused window, mouse goes to where you click. It makes sense.
I'm using FFM in Ubuntu classic (non-Unity) right now. Mouse and keyboard events go to the highlighted window and the highlight follows the mouse (with a few minor exceptions which is why some people call it sloppy focus). Clicking doesn't affect where the events go. Not sure what you're talking about...? Maybe plain old click-to-raise like Mac and Windows?
If I mouse to a different window, focus does not follow (like MS). However... if I use the mousewheel, it applies to whatever window is under the mouse. As windsurfer says, this is cool because I can navigate around in one window while keeping my editor typing in another.
However, in disagreement with windsurfer's claim, my middle-click DOES change focus, as with my left- or right-click.
Anyway, I hate full-on sloppy focus, but I sure love this sloppy-mousewheel-focus.