gnome launcher in terminal doesn't

When an application is set to run in terminal, it doesn't!

1. Right click desktop.
2. Create Launcher.
   Type: Application in Terminal
   Name: ls
  Command: /bin/ls
  Comment: list files

3. Here is the resulting .desktop file:

 $ cat ls.desktop
 #!/usr/bin/env xdg-open

 [Desktop Entry]
  Encoding=UTF-8
  Version=1.0
 Type=Application
 Terminal=true
  Name[en_US]=ls
 Exec=/bin/ls
 Comment[en_US]=list files
 Name=ls
 Comment=list files

4. Click on it, and NOTHING happens. (or so it seems)

5. Further investigation (eg with sleep 10) shows that the command is running in a terminal, and then instantly auto-closing the terminal afterwards!

We need an option to keep the terminal open after the command exits (which should be the default). Also, right-clicking an existing launcher should let you set whether it runs in terminal or not.