Negative shadow size
It should be possible to make shadow size negative as well. It sounds odd, but in stead of making an outer shadouw bigger, it becomes smaller. And the other way around for inner shadows.
The same goes for distance.
sorry to stop your flow, but issue #6 already brings that up. though it's good to hear, that people care about that.
I'm thinking about a slider whose zero point is in the center. do you think this would be a good UI solution?
I guess so. A slider is definately the way to go for something like this. But since shadow size is seldom negative, maybe not put zero in the middle, but 25% from the left. That's what I would do anyway.
yeah, a slight offset to the left would be a good idea. let's see :-)