About the licensing, I think you got something wrong here: this is not a plugin, it's a standalone program! Therefore the GPL won't interfere with SH3D for any user.
It is *not* reusing any of SH3D code, I just took the specs of the SH3D file and built the app from there, comparing the visual outputs.
This is also why there are plenty of bugs to tackle
If someone wants to write a shortcut launcher plugin from the SH3D interface, well go ahead, personnally I have no idea how this is done...