An item of great usefulness would be a control in the skin editor for making drop down lists of items. There should be an option to allow the user to type in a custom value instead of just choosing from the list. Whether or not icons could be a part of the list (like grids) is another suggestion.
There is nothing in DM currently that can adequately do what drop down lists do. They provide a very small item on the interface that drops down to provide a list intuitively that just makes other methods feel clunky.
There is a drop down list on the very form I am filling out this feature request with.