I've replaced the wizard JavaScript code in 5.07, to simplify things considerably.
The basic "Wizard form" now looks, and works, better. The regular "Save" button doubles as the "Finish" button (remember you can rename the text on the button, same as you do for a Login form, if you want the button to say "Finish").
I looked into the concept of "validate pane before moving on" but that's somewhat non-trivial to implement, so I've left that for a future release.
cheers
Bruce