I'm not sure what the Apple Remote does is documented, Steve, but I'll certainly consider it for a future release...

Add to Library?
 

This may be in netTunes already, I can't tell, but here's what I would like.

When using a client, I would like to be able to add a file to the server library. Like when I buy a song from iTunes Music Store.

It is there, Ed. Just press Cmd-o to add a file to the library (which has to be on the "far side" -- on the server, or available on the network).

Hope that helps!