4. There should be graceful handling of the situation where there's an
large number of toolbar items. I feel the Epiphany style is OK for a
small number of items, but it might be pretty unweildy for a large
number of tool items (say, 100 or so). Besides, D&D for customization is
pretty overrated IMO. It migtht make a cool GUI gimmick but makes life
difficult for users of more complicated apps like office suites and
IDEs. It is also difficult to make it a11y friendly I think. I
personally think the OpenOffice 'Tools->Configure' thing is pretty cool
since it brings menu editing, toolbar and toolbar item customization,
keyboard shortcuts and user-defined event macros under one consistent
GUI. Here're the screenies: