For Linux libinput “Disable While Typing” (DWT) problems, this page claims libinput will only use the DWT setting if the keyboard and touchpad are either both identified as internal devices, or are both identified as the same device. (The assumption is that if the keyboard and touchpad are separate USB devices, then they won’t be in a fixed position where palm rejection is problem.) If they are identified as different devices, a local device quirk to identify them as internal might help.
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