I've an idea, for a simple and useful feature. The server list.
All it is, is where the ''multiplayer'' tab has a list. Under that it has 3 buttons, ''add server'', ''direct connect'', and ''connect''. ''Add server'' button allows one to input the address of a server, and that is added to the list. Clicking that one on the list and clicking ''connect'' connects to that server. ''direct connect'' allows one to connect to a server without needing to add it to the list.
Eh?
EDIT: upon connecting to any server, before it connects, it prompts the player to input the password. If incorrect, the connection is not established. If correct, the connection is established.