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You can easily write plug-ins to display and edit your custom data types:

Screen shot of plug-in in action

The plug-ins must have the '.plugin' extension and must be installed in either of these two locations (note that tilde (~) is your home directory):
~/Library/0xED/Plug-Ins
/Library/0xED/Plug-Ins

You can download a sample plug-in project (IP address type implementation) here.