Note that we have a few ranking methods available -- the tabs on the right side of the page just above questions.
If you sort by Active, then the re-tagged questions rise to the top. However ..
If you sort by New, only new questions appear at the very top.
If you sort by Hottest, questions with activity other than re-tagging seem to appear.
So, I think we're fine since the site is flexible enough to offer a few different views.
The remaining issue is what the front page of the site shows when the user has not performed any sorting or clicked on "Questions". In this case, maybe we could ask that the "default view" for the front page be the "Hottest" questions rather than "Active"?
I'd rather not exclude re-tagging entirely since it's nice to have the option to see that particular activity (since not only moderators can do this, and we'd like to catch mistaken re-tags).