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KDE Goes and Does It (Double-Click By Default, That Is) - OMG! Linux
(www.omglinux.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
There's a little + that you can click on the icons.
Or, you can use the keyboard arrows and spacebar.
Not sure if there's others.
Edit: Just found another one actually. Middle-clicking selects without opening.
This works better than the little + on the icons because the + behaves like a "ctrl-click."