New feature: Pick default value.
When you are using the "Defaulting" wizard, you can set up a particular row to be set as "default".
Since this new step version, the defaulted item will select automatically in the form when a Foreign Key is pointing to that table.

It seems like more a fix because the "default" feature exists still the beginning of Cook Self Service, but it has never been took in consideration for preparing a Foreign Key combo in a form.
Enjoy it.