Globally installed extensions

Another fancy feature-idea with really low priority:

What if users could do a global install of an extension, and all vorpal programs would automagically be able to use the commands provided by the gobally installed extensions? I suppose this is doable (or else vorpal-use wouldn't exist, right)? This would not have to be limited to commands, the extensions could just be loaded as usual. This way, global extensions which monkey-patch vorpal would be possible as well.

However, some extensions don't provide out-of-the-box usable commands, e.g. Vorpal-Tour. These should not be automatically included. Maybe differentiate between extensions and plugins?

This would allow really cool stuff. As a user, I could just install vorpal-less and have it in all my vorpal-based applications. I did not look at the architecture of Cash yet, but if the single commands are implemted as extensions, all of these could become globally available as well.