Hi Kinsley,
I currently favour the solution where the "Bookx Filter" sidebox contains a popup select element for "author type" which then reduces the authors listed in the sidebox popup "show authors" as well as it would filter the page "authors list" which you get when you choose "Show all authors" from the author filter popup.
Unless you tell me this won't work for your setup, I'll go ahead and implement it this way.
I agree that an update to 0.9.3 will not be of much use if the 0.9.4 is just around the corner.
p.
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