Function proxy and uri are very poorly named.

proxy and uri are methods

It can easily make people think that it is the server

Not likely, but the documentation definitively clears up what the method does.

, should be called endpoint as it is perceived in the entire SOAP world.

Thats a good suggestion to make to the developers.

uri is hardly needed, but all examples in SOAP::Lite doc have that

The docs say otherwise: Nothing is specified by default and your call will definitely fail if you don't specify the required uri.

you really cannot easily guess what should be passed in..

Why would you guess when you can read the documentation which explains it?

We've all been frustrated, but this kind of module review is not productive. You should talk to the developers.