Do you have an overview available of all filters and hooks for WPSP 1.2, like you have for GeneratePress? I use that overview a lot and it would come in handy if there’s an overview for WPSP too.
Unfortunately, we’ve yet to have a Hook visual guide similar to what we have with GeneratePress.
For now, the way to go about this is to read the code contents of the plugin files.
The files are available to the public. You can view them here and do a “filters” or “action” word search to find all do_action()/add_actions() and apply_filters() available. https://github.com/tomusborne/wp-show-posts