Currently when creating "Share" links, the URL that is generated is quite long, which makes them somewhat unwieldy:

Example:
https://someserver.somewhere.com/airsonic/ext/share/kXQLh?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJwYXRoIjoiL2FpcnNvbmljL2V4dC9zaGFyZS9rWFFMaCIsImV4cCI6MTYwMjE1MTYxN30.AxyzQ80e9s0gp0QxIPTcRcjzCc0cXZl16Z6YppOgRqg

It would seem that these links should be able to be shortened considerably without significantly compromising their security (being hard to guess).