Both Kindle and Kobo in-book navigation do suck. Anyone who has configured Coolreader or Alreader screen-nav will know that. At least Kobo allow alternate software to be run
@OP. Try Coolreader. Under Android, the annotation system is nice. Not sure about kobo version.
@NiLuJe. Thanks for insight into kobo and kindle software and hardware. So the forma touchscreen is better and the H2O screen not so much? Can you comment on the clara?