As far as I am aware, it is very difficult if impossible to intercept *most* of the functions that RIM already has in place for the default applications. You can of course add your own menu items to trigger your own screen, but I would say with a high level of confidence that you cannot override the menu item action. This is mainly due to the fact that you do not control the screen, therefore you also don't control menu creation. At that level, you can merely participate with your own menu item.
I'm not the absolute authority, but I think that is the best answer you'll get without paying for RIM support.
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