You are correct, the “edit options in the cart” plugin for WooCommerce only does Options.
Our add-ons plugin lets you manage add-ons, which are like product options but can be applied for groupings of products via both tags and categories. This does not currently support integration with the edit-in-cart plugin, which is only for product options.
With a custom development, we could in fact link these two plugins together with support for one another, and extend the “edit in cart” plugin to also allow add-ons.
When you say Add-ons, do you mean this or could you just use traditional Product Options instead of “add-ons”, in which case you just need the first plugin and won’t need the 2nd?