One of the many things on my (long) to do list that i have not been able to do recently due to a rather pleasant surprise, it was very quick and easy though.
Everyone has seen those forms that already have text in the inputs such as "Search for..." that then disappears when the edit gains focus. Thats what this does, all you need to do is add one line after the edit/input, and thats it!
Global $EDIT_DEF_ITEMS = [[0, 0]]
Func _GUIEditSetDefault ($hEdit, $sDef)