Damn dude, I never knew you could actually make create stuff like this with Lua. The source code looks comparatively easy. Can you link us to the Linex source files inside the repo? I can't seem to find it. Additionally, you could add some sort of button which helps to add new coins easier.
For the Linux mint desklet, there is a different repo as they have a native solution for creating widgets, you can check it out here:
https://github.com/pbojan/cryptocoins-desklet-cinnamonI will look into if it is possible to make adding new coins easier. Thanks for the feedback.