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is there a way to add universal shortcuts for input / text fields in OS X and/or chrome itself such as Control + U to delete everything to the left of a line, Control + W to delete the left word etc. or cursor positioning like Control + a to move to beginning of a line?

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This is definitely possible, see https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/EventOverview/TextDefaultsBindings/TextDefaultsBindings.html for a good discussion of text system key bindings.

To accomplish what you're after save the following to ~/Library/KeyBindings/DefaultKeyBinding.dict:

{
    "^u" = "deleteToBeginningOfLine:";
    "^w" = "deleteWordBackward:";
}

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