It would appear that the functionality to add shortcut keys in SSMS2008 is mostly implemented, however, I don't seem to be able to shortcut key to anything.
For example,
Tools --> Customize --> Commands --> File --> New Query
Clicking on New Query and pressing the "Keyboard..." key simply opens up the Options screen. (In most MS IDE's, this will facilitate shortcut creation.)
In Options --> Environment --> Keyboard there is a list of Query Shortcuts, but I don't see any way to add shortcuts here.
Any thoughts?