Can either the fixed order be changed, or the order
I swapped 'save' and 'close' so you can keep clicking
at the same point when you want to close a lot of
files. If you do that, all the modes are consistantly
'new', 'open', 'close', <mode specific buttons>.
It's also nice to disable your look and feel & increase
the separation of the buttons on OS X to make it look
more like a native application.