(我不想听别人说我有多疯狂想要那个!：）
焦点跟随鼠标也被称为点对焦点、指针焦点和(在某些实现中)草率焦点。[添加其他术语，使搜索更容易!]]鼠标光标
当前回答
你可以在终端机上做。通过在命令行中发出以下命令来创建应用程序:
defaults write com.apple.Terminal FocusFollowsMouse -bool true
对于X11应用，你可以这样做:
defaults write com.apple.x11 wm_ffm -bool true
在Snow Leopard中，使用这个:
defaults write org.x.X11 wm_ffm -bool true
显然，有一个名为CodeTek虚拟桌面的程序可以在系统范围内模拟它，但它需要花费$$(他们从未为OSX Leopard推出过版本)。
其他回答
Amethyst支持此特性。它可以很容易地安装与酿造安装紫水晶。
下面是我使用的配置文件。它关闭了所有的功能，除了焦点跟随鼠标。保存到~/.amethyst。
{
"LAYOUTS": "----------------------",
"layouts": [
],
"MODIFIERS": "----------------------",
"Valid modifiers are": [
"option",
"shift",
"control",
"command"
],
"mod1": [
],
"mod2": [
],
"COMMANDS": "----------------------",
"Commands are": {
"cycle-layout": "Cycle layout to the next layout",
"cycle-layout-backward": "Cycle layout to the previous layout",
"focus-screen-1": "Focus the main window on the first screen",
"focus-screen-2": "Focus the main window on the second screen",
"focus-screen-3": "Focus the main window on the third screen",
"focus-screen-2": "Focus the main window on the second screen",
"focus-screen-3": "Focus the main window on the third screen",
"focus-screen-4": "Focus the main window on the fourth screen",
"throw-screen-1": "Throw the focused window to the first screen",
"throw-screen-2": "Throw the focused window to the second screen",
"throw-screen-3": "Throw the focused window to the third screen",
"throw-screen-4": "Throw the focused window to the fourth screen",
"shrink-main": "Shrink the main pane of the current layout",
"expand-main": "Expand the main pane of the current layout",
"increase-main": "Increase the number of windows in the main pane",
"decrease-main": "Decrease the number of windows in the main pane",
"focus-ccw": "Move window focus counter-clockwise on the current screen",
"focus-cw": "Move window focus clockwise on the current screen",
"swap-ccw": "Swap focused window with the next window going counter-clockwi$
"swap-cw": "Swap focused window with the next window going clockwise",
"swap-main": "Swap focused window with the main window of its screen",
"throw-space-1": "Throw the focused window to the first space",
"throw-space-2": "Throw the focused window to the second space",
"throw-space-3": "Throw the focused window to the third space",
"throw-space-4": "Throw the focused window to the fourth space",
"throw-space-5": "Throw the focused window to the fifth space",
"throw-space-6": "Throw the focused window to the sixth space",
"throw-space-7": "Throw the focused window to the seventh space",
"throw-space-8": "Throw the focused window to the eighth space",
"throw-space-9": "Throw the focused window to the ninth space",
"throw-space-8": "Throw the focused window to the eighth space",
"throw-space-9": "Throw the focused window to the ninth space",
"toggle-float": "Toggle the focused window between being floating and tiled"
},
"screens": "3",
"cycle-layout": {
"mod": "mod1",
},
"cycle-layout-backward": {
"mod": "mod2",
},
"select-tall-layout": {
"mod": "mod1"
},
"select-wide-layout": {
"mod": "mod1"
},
"select-fullscreen-layout": {
"mod": "mod1"
},
"select-column-layout": {
"mod": "mod1"
},
"mod": "mod1"
},
"focus-screen-1": {
"mod": "mod1"
},
"focus-screen-2": {
"mod": "mod1"
},
"focus-screen-3": {
"mod": "mod1"
},
"focus-screen-4": {
"mod": "mod1"
},
"throw-screen-1": {
"mod": "mod2"
},
"throw-screen-2": {
"mod": "mod2"
},
"throw-screen-3": {
"mod": "mod2"
},
"throw-screen-4": {
"mod": "mod2"
"throw-screen-4": {
"mod": "mod2"
},
"shrink-main": {
"mod": "mod1"
},
"expand-main": {
"mod": "mod1"
},
"increase-main": {
"mod": "mod1"
},
"decrease-main": {
"mod": "mod1"
},
"focus-ccw": {
"mod": "mod1"
},
"focus-cw": {
"mod": "mod1"
},
"swap-screen-ccw": {
"mod": "mod2"
},
"swap-screen-cw": {
},
"swap-screen-cw": {
"mod": "mod2"
},
"swap-ccw": {
"mod": "mod2"
},
"swap-cw": {
"mod": "mod2"
},
"swap-main": {
"mod": "mod1"
},
"throw-space-1": {
"mod": "mod2"
},
"throw-space-2": {
"mod": "mod2"
},
"throw-space-3": {
"mod": "mod2"
},
"throw-space-4": {
"mod": "mod2"
},
"mod": "mod2"
},
"throw-space-5": {
"mod": "mod2"
},
"throw-space-6": {
"mod": "mod2"
},
"throw-space-7": {
"mod": "mod2"
},
"throw-space-8": {
"mod": "mod2"
},
"throw-space-9": {
"mod": "mod2"
},
"toggle-float": {
"mod": "mod1"
},
"toggle-tiling": {
"mod": "mod2"
},
"display-current-layout": {
"mod": "mod1"
"display-current-layout": {
"mod": "mod1"
},
"MISC": "----------------------",
"floating": [],
"float-small-windows": false,
"mouse-follows-focus": false,
"focus-follows-mouse": true,
"enables-layout-hud": false,
"enables-layout-hud-on-space-change": false
}
不幸的是，CodeTek虚拟桌面专业不再开发，该公司似乎已经退出业务几年前。
历史参考:http://www.codetek.com/ctvd/(不适用于新的OS X版本!)
历史回顾:http://www.osnews.com/story/6144
使用CodeTek Virtual Desktop Pro，你可以获得焦点-跟随-鼠标，并禁用自动上升，它也有一个虚拟桌面的寻呼机——类似于Fvwm在Linux上的工作方式。它运行得非常完美——这是我买过的最好的软件。 它与所有应用程序都一致，切换应用程序，将窗口移动到不同的工作区，以及导航工作区都比最新的OS X版本[10.6,10.7,10.8]要容易得多。
不幸的是，随着Mac OS X 10.5 VirtualDesktop Pro停止工作，看起来苹果积极确保CodeTek不会继续在它上面工作。
令人遗憾的是，苹果粉碎了CodeTek和它的产品——虚拟桌面专业版(Virtual Desktop Pro)真的比OS X当前实现的工作区更好。它的工作原理基本上就像LINUX上的Fvwm——超快的导航——没有不必要的点击或鼠标手势……
看到苹果规定窗口管理器(Finder)的行为，似乎不再允许第三方替换Finder，我很难过。
尝试了这些选项后，我的Command-Tab开始表现得很奇怪。以下是它如何再次关注应用程序的解决方案:
之前的一个特性，即终端的窗口焦点随着鼠标移动而改变的能力，在10.6中被打破，导致Command-Tab不能正确地转移窗口焦点。要解决这个问题，只需在终端中粘贴以下命令:
默认写com.apple.Terminal FocusFollowsMouse -string否
然后重新启动终端。
给DwellClick一个尝试。虽然这不是它的预期目的，但自动单击行为有一个类似于自动提高或焦点跟随鼠标的副作用。
就我个人而言，我只在光标移动停止后使用左键点击的功能，但也有修改器点击和窗口拖动辅助功能，这非常方便。
在浏览网页时，这也有点令人沮丧，因为你要么想要禁用应用程序，要么更注意光标停留在哪里(例如，不要停留在任何你不想激活的链接或按钮上)。
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