Well after activating verbose mode I see that koreader is aware of the keypresses but it does nothing with them, so, I assume I'm doing bad the key assignation...
Code:
01/22/22-15:15:07 DEBUG AutoTurn: onInputEvent
01/22/22-15:15:07 DEBUG input event => type: 42 (nil), code: 272, value: 0, time: 1642860907.940239
01/22/22-15:15:07 DEBUG AutoStandby:onInputevent() instance= table: 0xa0263548
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01/22/22-15:15:08 DEBUG AutoTurn: onInputEvent
01/22/22-15:15:09 DEBUG input event => type: 40 (nil), code: 1, value: 0, time: 1642860909.112940
01/22/22-15:15:09 DEBUG AutoStandby:onInputevent() instance= table: 0xa0263548