Nice!
You'll have to take care of this ibrary. If it is writeable by anyone, then anyone can update a library. Could not be intended, but could also cause issues because you cannot update a library if it is in use, and it can be loaded by any user in this case. You'll see how it works. I am curious of your experience after a few month.
We did the same as you but the folder is readable by all users but only a radminusers group can write into it.
We want to manage the library in this folder (which packages and in which version)
Glad you found your answer.