Howdy! I think y'all are doing a good job and would like to contribute with an interface suggestion. Just ignore the rounded corners and lack of window manager, and see if it's not impossible. Or improbable. Or just doesn't work.
Some notes of my own:
The "Launch" bar would be a way to quickly select and connect to a predefined server (with the last connected server being the default one).
The "Setup" button would be a link to the "Multiple Server Connect" manager.
I'll start by shouting out a big LOL since I dind't notice the "User Horizontal Splitter" option.
Apart from the button, you can do all the other changes with a skin.
I've had a look at QT Designer and used the .ui file to simply change the size and position of the two windows, but I don't have the knowledge to do any of the more "advanced" stuff. Perhaps you could recommend a guide or howto?