[Plugin: WP E-commerce Expanding Categories] Suggestion: Save state

This is a nice concept, but it lacks a much needed feature: the ability to preserve the list of opened and closed categories between page loads. Without that, users would quickly start hating the experience with the site, as every page load closes the category(ies) they’re browsing.

https://www.ads-software.com/extend/plugins/wp-e-commerce-expanding-categories/