How do I create a new launcher for Drag & Drop
gksudo "gnome-open %u"?
Have you tried something like this (I'm at mobile, I can't make it more specific until I get home but I think you will understand):
1) Right click at the Desktop and choose "Create a Launcher".
2) Paste the name and the command you want, choose the icon you want and hit "OK".
3) Drag the launcher you just create to the Unity Launcher.
4) Congratulations, you have your launcher done!