Something I've always wanted to be able to do (but never managed to figure
out) is to turn off "Track Changes" for specific areas of a Word document,
particularly the Header and Footer.

With lots of automatically updated fields in the header and footer (Page #
of #, file name, date last saved etc) the balloons for all the changes
resulting from the header and footer being automatically updated can swamp
the "real" changes I'm trying to track.