As a Roblox developer, it is currently a bit tedious to type out instance references in the command bar. While auto-complete helps a bit, it can still be tedious to write references to instances that are buried deep into multiple nested descendants.
It would improve our experience of running command-line scripts greatly because we could just right-click an instance in the Explorer window and copy to retrieve its scriptable reference. This would effectively be the Instance:GetFullName() method integrated into a context menu. It would be very simple to make a plugin for this, but unfortunately we do not have clipboard access in plugins.