Can we merge or rename tags?

edit

Is it possible to have a tag merge/rename function?
This would be extremely useful when you get tags that are duplicates: UI UserInterface UserIF GUI

Here is how I could see this working:

  python manage.py tag_rename UserIF UI
     Renaming "UserIF" to "UI":  2 Questions [34, 45]

  python manage.py tag_rename BogusTag UI
     Tag "BogusTag" does not exist

If a destination tag doesn't exist, it is created.