I'm finding that fine tuning values with sliders too coarse. Sometimes you want to really hone in on a value and the slightest movement of the slider one way or the other completely goes past the value you might want. I know you can manually type in the numbers, but that is tedious with trial and error when you might be talking about 6 decimal places.
It would be very convenient to be able to just use the arrow keys up and down, or left and right, to increase or decrease the values with a bit more refinement. Perhaps even up/down might be fine adjustment while left and right arrows might be a little coarser? Or perhaps shift up/down (or some other modifier) could be the coarser adjustment.