for the moment there is no way to force title and description.
If no title is entered, it automatically takes the filename as title.
There is a reason for that. if you force title and description, you run into problems with multiple uploads. For instance with flashuploader a user can upload 50 images at the same time. If you force him to write 50 different descriptions, he will give up after 3 and just type in blabla to get his upload finished.