I can't believe I missed this one

[LavCat]

Here is a Basin thread on the subject.
http://www.theamazonbasin.com/wow/forums/i...showtopic=22956

Most specifically is a program listed at the bottom called KeyTweak which you could use to remap that caps lock key to something a little more acceptable like a left shift functionality.

So near and yet so far! Thanks for trying anyhow. The registry change worked perfectly. The caps lock key then had the function of left shift, which for me is good in general Windows use also. Unfortunately I could find no way in WoW to bind the left shift to anything, so the caps lock is now effectively just a dead key, which does not help.