I wish Blogger would let me rename tags

Occasionally, if you read this via RSS, you will notice that I repost old articles. This isn't intentional - any time I edit or retag a post in Blogger, it puts it back on the feed. I don't see any way to say "quietly republish this post". The same problem occurs if I want to rename a tag - I have to remove the tag from all posts, and then re-add it to all posts. Please, Google, add features to Blogger to make this less painful.