Hi there, @Sean_McMeen and welcome aboard 
This idea is already on the Wishlist and I’ve merged your comment with it. If more users upvote this idea, we’ll try to consider it in the future.
Regarding the Write a Review button, if the automatic review collection is supported, this button will be available too.
However, currently, it’s not available if manually add reviews to the widget (Custom source option). We also have a request to add this button for Custom sources and you can upvote it here 
- Write a review button for custom sources