There's also a feed of "bookmarked" books for the "to-read" shelf
https://www.goodreads.com/review/list_rss/3250760-chris-aldrich?page=1&per_page=100&shelf=to-read&sort=date&utf8=%E2%9C%93

This should allow one to split the other feed items out of the main feed to separate the bookmarked books and the status updates!

The format of this feed also allows for different shelves and potential orderings.