Hmmm... Good questions
Ill review this and see what the options are, at the very least you should be able to enter text directly in the default value textbox under advanced settings and it will default to that item in the combo box. Ill test this tomorrow and if it can't function see when we can get a patch out for this, probably in the next incremental release which should be ready next week to fix a few small issues such as this.
-Chad