Style Importer, which would allow for binary modules to add different display options, such as native windows skinning types, images, BB styles, etc.., and the ability to change them, such that anything using it would also change (make style changes during run-time, fire an apply command, and all are reloaded).

However, it'd be crazy-hard to get working :).

WinControls: a module to allow the use of dropdown boxes, list boxes, comob boxes, text boxes, text areas, checkboxes, and radio button groups.