In 1.4, you can have multiple tagging scripts.
It is possible for the list of tagging scripts to be hidden completely if you move (or a change in screen size automatically moves) the splitter bar too far to the left. There is then no visual indication that it exists. This can lead to user confusion (certainly I was confused until I worked it out!!)
The list of scripts should have a minimum width of (say) 100px to avoid it being hidden completely.