Our initial set of automation rules consists of things that are not readily doable with autoscaling. We do use the AWS APIs but I wouldn't consider what we do to be a UI layer. We automate things that are currently hard or impossible to do with the AWS console. A great example of this is scaling RDS storage or DynamoDB capacity based on actual use (and not just as a one-off operation).
We can't populate those other dropdowns at that time because they're based on real values. Here's what a filled-in set looks like: http://i.imgur.com/tMLtncD.png
Right now the automation is done by a service (no autoscaling groups are created on your behalf). Do you have triggers in mind that you would like to create autoscaling groups for you?