It would be helpful if a "Data Type" column was added to the AttributeManager, so we could view/change/set the data type of each attribute. Another option would be to allow the data type to be set manually when a new attribute is created.
I know it is possible to set the data types on the writer feature type, but I think this would be especially helpful when creating a new attribute. Additionally, if I am copying an existing AttributeManager (within the same workspace, or into a different one) it would be nice if I could set the data type for an attribute once, and that would be preserved when the transformer is copied - That way I wouldn't have to manually change the data type on every output feature type.