Man, I just gotta say it... If the controls are given finer steps so there are more possibilities between + and - all it will do is allow those that want more control to have it, with the only cost for those not requiring it being the need to press the + or minus buttons more often to make a change. Not even that big a deal since you can touch to set approximate position on the sliders then use +/-. Seems like a no brainer to me, he's just asking to be able to cycle through the fonts by a point at a time instead of two points, etc.
Finer control will not yield a negative experience, just offer more options. What's the big deal. As far as tweaking anyone's nose at KOBO there are something like 70+ pages in the threads requesting firmware changes, maybe they ought to consider providing some more of those changes before the threads take over the net!