Visting ServerFault this morning there were a large number of old questions (posted 2009) that have been edited and therefore bumped to the front page. While I find this highly irritaing as it is, two of these questions were already closed (one | two) so apart from having the questions bumped to the front page and a tag added they have very little use.
I would go so far to ask that tag-only edits don't bump the question.
You should take that up with squillman (and this should not be asked here, so I am migrating it back to meta.sf)
https://serverfault.com/users/1054/squillman?tab=activity
Our policy has been stated many times on this -- edits bump the post to the homepage so that the community can vet the changes, exactly like what is happening now.
As Jeff said, this is done on purpose and isn't going to change. Edits need vetting, tag-edits perhaps more so since the rep requirements to do them are a lot lower. We haven't had much edit-abuse here on SF, thankfully, but we do need to keep bumping anything that gets edited.
Where it gets annoying is when someone is doing a manual retag of a bunch of questions. A month or two ago we were doing much the same with the vmware tag (well, mostly Iain did), which required going through hundreds of questions. It also took a long time since the etiquette most of us follow is to do a few at a time to avoid spamming the heck out of the main page and push legitimate new questions w-a-y down where they won't get attention.
