After a week of extensive use I notice the page flipping problems actually becoming less. This can be the result of either getting used to the way to 'properly' press the button, or the button losing a bit of its stiffness after some use. Really not sure which of the two it is, maybe a combination of both.
To me, this is something I gladly live with, since I am a very happy Cybook user given all the good aspects of the device
At any rate it's by no means more cumbersome than wetting your fingers to flip a paper page.