Select Files For Upload

Currently there is a select all button that if you click it, it will unselect all the file formats. This is ok so far. But it would be better if you could have a set default button to select which file formates you want to select all the time with out having to unselect the files individually. If you have selected the file to upload then select "select all" the file that you previously selected goes away. You can still have the select all button to select all formates and you could hit the default button if that is what you want as a default. Regards