@7hir7een: Well, at least it's not something new, there's always been something wonky in the way pageturn keys can be inhibited by the system since the KV...
And since part of it appears to be tied to the windows manager, and we inhibit that, that feels like an intractable situation...
So, last ditch experiment:
Can you try running
Code:
lipc-set-prop -i com.lab126.winmgr grip_enabled 0
*before* launching KOReader, but *after* having launched KUAL?