Hello! Here some rather unsorted stuff which comes to my mind...
It should be possible, but not very easy... there are even some basic features in HTML which don't really work without JavaScript. The IE 6 submits all submit buttons with the inner HTML as value instead of just the active button (the one which was clicked) with the value attribute as value. But you can use input fields of type submit instead with the limitations for styling the label (like drawing an underscore below the access key.)
And a lot of Tobago features of Speyside -- for example Ajax related things -- wouldn't be possible anymore. Doing stuff like menus without JavaScript will be pretty hard, too.
At the very beginning the Scarborough theme was meant to be an HTML only theme. But that changed pretty soon. Perhaps for an accessible theme a theme without JavaScript would be nice basis to build upon.
Regards Arvid
