There might be a plug-in for this, but I didn't find one.
Is there a way to pre-check the category for a post insert? I see that you can include the post_type to the post-new.php code.
I used categories to identify several different page items and want to make it as easy as possible for users to insert a post without having to remember which page they are posting for.
I'm still feeling my way around what are the "better" ways to do things in WordPress.