The Series III mixer will power on in the same settings it was powered off. There is no means to set it to power up with a specific scene.
If you would like to make a feature request for the StudioLive to be added in a future release, we have a forum section specifically for Feature Requests. This is the area for such suggestions and is monitored by the development team.
* You must be logged into the Answers Site in order to post your feature request.
Read through the previous posts to see if your request is already added by another user. If so, post in their listing to add to the numbers requesting the feature you would like to see added.