Hide app icon from dock but keep icon in task switcher?
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I'm pretty sure this is not possible, and that the dock and app switcher use the same list to decide what should appear in them.
The reason I believe this is because there is actually a procedure to remove an application icon from the Dock while the target application is running, which has nothing to do with the LSUIElement key. (It essentially consists of renaming / moving the app bundle and then restarting the Dock.) Even so, the app doesn't appear in the switch.
(You can find the complete procedure at macosxhints.com if you're interested.)
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