[kh99]

I was looking at the wrong section. When you're modifying a template for a style that was inheriting that template, $_POST['do'] is set to 'inserttemplate'. In that section of the code it always calls print_build_style().

Edit: Specifically, it looks like the style table has a list of template ids for all templates in that style. Looks like a serialized array of arrays, so maybe if you don't want to call build_style you could try just updating that field.