I'm glad you like the plugin 🙂
Unfortunately neither is possible yet. I'm planning to re-design the whole filters section in the future, so there is definitely going to be an author, ordering and other new filters as well. If there was like an easy modification to do it right now as a temporary solution, I would help you, but unfortunately it's a lot more complicated.
Luckily I'm updating the plug-in regularly, so this is going to happen 🙂Best,
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