Office could be improved in how it handles extending of its smart tag functionality.

Currently adding a custom smart tag requires editing registry; this should not be necessary. It would be better to implement an “Add Smart Tag” button to the Smart Tags tab of the AutoCorrect dialog.

Also, the “More Smart Tags” button in this dialog should be implemented as a hyperlink, as it links directly to a page on the Microsoft website.

Figure: Smart tag settings in Microsoft Word