E.M., I guess that's expected behavior. I've also noted that once you flip page flow on, your abilities to zoom in landscape are rather impaired. Perhaps that's one of the reasons page flow isn't enabled by default

This way or another, I think it's uds limitation, and as such can only be remedied with swapping the uds binary.
BTW, for early adopters:
https://www.mobileread.com/forums/showthread.php?t=89876 . It's probably still buggy, but already useful.