Add the ability to select a parent for the following page or spread.
In the "Parent Options" dialog box (on Windows, though I'm sure it's pretty consistent cross-platform) there's the options for the current spread.
What if we could add a limitation that allowed you to specify the parent style for adding pages?
For example, if I had a chapter head page, having it be able to automatically switch to the standard body parent would be a time saver for that highly repetitive task.
The option would be after "Number of Pages" and probably say something like "Parent for Following Page" with a selector for the existing parents, and another selector with "Following Page" and "Following Spread" as options.
Not sure how it would all look, but that's the core of the idea.