When this new nine-button palette was introduced in Word 2000 the immediate result was the article at http://word.mvps.org/FAQs/TblsFldsFms/CellAlignmentProbs.htm. That was very helpful for Word 2000, 2002, and 2003, and I even managed to retain it into Word 2007 by virtue of having a Normal.dotm based on my Word 2003 Normal.dot.
Unfortunately, there is no longer a Vertical Alignment button available for customizing Word 2010 (Cell Alignment is now used for the nine-button palette), but you can add the individual buttons to the QAT. In the Customize Quick Access Toolbar dialog, select All Commands or Commands Not in the Ribbon and add the buttons for Align Bottom, Align Top, and Center Vertically.