When comparing Default Folder X vs Karabiner, the Slant community recommends Karabiner for most people. In the question“What are the best power user tools for macOS?” Karabiner is ranked 29th while Default Folder X is ranked 39th. The most important reason people chose Karabiner is:
For example: Fn+C now calls up contextual menus for me with: <!-- Fn + C = same as right-click mouse --> <item> <name>kybd control click</name> <identifier>private.keybd_to_control_click</identifier> <autogen> __KeyToKey__ KeyCode::C, ModifierFlag::FN, KeyCode::VK_MOUSEKEY_BUTTON_RIGHT </autogen> </item>
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Pros
Pro Directory assistant Finder Integration
From the Open / Save file dialog, you can access your recent, favorite, and open folders. Includes a menubar item and can add to the Finder toolbar for quick access.
Pro New features are intuitive
Many of the features provided by Default Folder are quite intuitive and quickly become very useful. When a save dialogue is open, just click on an open Finder window to change the current path to that directory. Integrated Quicklook previews make selecting files in the list view much easier, and Spotlight tags can be added directly from the save dialogue.
Pro Low-level key bindings/mappings
For example: Fn+C now calls up contextual menus for me with:
<!-- Fn + C = same as right-click mouse -->
<item>
<name>kybd control click</name>
<identifier>private.keybd_to_control_click</identifier>
<autogen>
__KeyToKey__
KeyCode::C, ModifierFlag::FN,
KeyCode::VK_MOUSEKEY_BUTTON_RIGHT
</autogen>
</item>
Pro Make FN key into a new modifier key for custom shortcuts across apps
Cons
Con Difficult to configure custom actions
Configuring custom actions requires editing an XML file with very strange syntax, for which it's difficult to find good documentation.