Definitely need this feature before it’s that useful unfortunately.
For example one of my categories is deals.
The title for that categorie is Deals | Sitename.com.
But the breadcrumb is ‘Deals’ using custom_breadcrumb as a custom field.
I have changed it myself, it was actually very easy to do. All you need to do is change it from fetching the title to fetching the post_meta data. As well as that I have made it so that Google Rich Snippets Tool finds all the breadcrumbs.
Thanks for the reply though.