To create your own keyboard shortcuts in Word, you must first click Customize from the Tools menu. You should see a button called Keyboards at the bottom of the dialog box. Click this button to bring up the Customize Keyboard dialog box.
and maby someone who can make plugins may help you if you aks nicly and see if they could make such a plugin.
anothr edit i just found this this may help
http://www.kenstone.net/fcp_homepage/basic_roll_your_own.html
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