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PS - I noticed that same thing with that left bottom button when using KOReader before I rooted my GL4. It's some feature unique to that app. Unless you know how to edit the actual apk for KOReader, you'll still need to root to get the physical buttons remapped!
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I was suggested to check this link
https://github.com/koreader/koreader...customize-keys although unsure if this still requires rooting.